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C1 adjective /ˌhaɪdroʊɪˈlɛktrɪk/

hydroelectric

Meaning
Relating to or denoting the generation of electricity using flowing water.
Example
The country invested heavily in hydroelectric power plants.
C1 adjective /həˈmɑː.dʒə.nəs/

homogenous

Meaning
Similar or uniform in nature; often used interchangeably with 'homogeneous'.
Example
The class was made up of a homogenous group of students.
C1 noun /ˈhɜːrniə/

hernia

Meaning
A medical condition where an organ pushes through the muscle or tissue holding it in place.
Example
The doctor diagnosed him with an inguinal hernia.
C1 adjective /ˈhær.oʊ.ɪŋ/

harrowing

Meaning
extremely distressing or upsetting
Example
It was a harrowing experience to witness the accident.
C1 noun/verb /hɛm/

hem

Meaning
the edge of a piece of cloth that is folded and sewn; to fold and sew the edge of cloth
Example
She hemmed the dress to make it shorter.
C1 noun /ˈhɑː.mə.nɪm/

homonym

Meaning
A word that is spelled and pronounced like another word but has a different meaning.
Example
The word 'bat' is a homonym because it can mean an animal or a sports tool.
C1 adverb /ˈhɛdˌlɔŋ/

headlong

Meaning
With the head leading; in a rush or without thinking.
Example
She rushed headlong into the new project.
C1 verb /ˈhɔːrɪfaɪ/

horrify

Meaning
to fill with horror; to shock or disgust greatly
Example
The violent scene horrified the audience.
C1 adjective /ˈhiːdləs/

heedless

Meaning
showing a reckless lack of care or attention
Example
He drove with heedless disregard for the rules.
C1 noun /ˈheɪvən/

haven

Meaning
a safe place or shelter
Example
The library became a haven for students during exams.
C1 adverb /ˈheɪs.tɪ.li/

Hastily

Meaning
in a hurried or rushed manner; quickly and carelessly
Example
She hastily packed her bags before leaving for the airport.
C1 noun /ˈhɒməˌfoʊn/

homophone

Meaning
A word that is pronounced the same as another word but differs in meaning, and often spelling.
Example
The words 'pair' and 'pear' are homophones.
C1 adjective /ˌhæpˈhæz.ɚd/

haphazard

Meaning
Lacking any obvious principle of organization; random.
Example
His haphazard approach led to project failure.
C1 noun /haɪˈpɒθəsɪs/

hypothesis

Meaning
a proposed explanation made on the basis of limited evidence as a starting point for further investigation.
Example
The scientist tested her hypothesis through multiple experiments.
C1 adjective /ˈheɪt.fəl/

Hateful

Meaning
causing or deserving hatred; extremely unpleasant or offensive
Example
His hateful comments hurt everyone's feelings.
C1 verb ˈhɪndər

hinder

Meaning
To obstruct or delay the progress of something
Example
Excessive rain hinders vegetable growth.
C1 adverb /ˈhɑr.tɪ.li/

Heartily

Meaning
in a sincere and enthusiastic manner; wholeheartedly
Example
She heartily welcomed her guests to the party.
C1 noun /ˈhɑː.stɪdʒ/

Hostage

Meaning
a person seized or held as security for the fulfillment of a condition; captive
Example
The police negotiated carefully to secure the release of all hostages unharmed.
C1 noun/verb /ˈhɛmərɪdʒ/

hemorrhage

Meaning
A significant loss of blood from a ruptured blood vessel, or to lose blood heavily.
Example
The patient suffered a severe brain hemorrhage.
C1 adjective /ˌhaɪ.drəˈpɒn.ɪk/

hydroponic

Meaning
Relating to the process of growing plants in sand, gravel, or liquid, with added nutrients but without soil.
Example
Hydroponic farming allows crops to grow without soil.
C1 adjective /ˈhæk.nid/

hackneyed

Meaning
Used too often and therefore lacking originality or freshness.
Example
The speech was filled with hackneyed phrases that failed to inspire the audience.
C1 noun /ˈhɔːr.nət/

Hornet

Meaning
a large wasp that can sting and is often aggressive
Example
The hornet built its nest under the roof.
C1 noun /hjuː/

hue

Meaning
A color or shade.
Example
The artist chose a soft blue hue for the background.
C1 adjective /həˈbɪtʃuəl/

habitual

Meaning
Done or doing constantly or as a habit; customary.
Example
He was a habitual latecomer to class.
C1 noun /ˈhɑː.mɪdʒ/

Homage

Meaning
special honor or respect shown publicly; tribute paid to someone in recognition of their merit
Example
The memorial service was a touching homage to the brave soldiers who sacrificed their lives.
C1 noun /hɑːrp/

Harp

Meaning
a large triangular musical instrument with strings that are plucked
Example
The angel played a beautiful melody on the harp.
C1 noun /ˈhɜːrbɪsaɪd/

herbicide

Meaning
A chemical substance used to kill unwanted plants, especially weeds.
Example
Farmers used herbicide to protect their crops from invasive weeds.
C1 noun /ˈhaɪndsaɪt/

hindsight

Meaning
Understanding of a situation only after it has happened.
Example
With the benefit of hindsight, we realized the decision was a mistake.
C1 noun /ˈhɔːrtɪˌkʌltʃər/

horticulture

Meaning
The art or practice of garden cultivation and management.
Example
Horticulture plays a vital role in producing fruits, vegetables, and ornamental plants.
C1 adverb /ˈhed ɑn/

Head-on

Meaning
directly facing; in direct confrontation or collision
Example
The two cars collided head-on at the intersection.
C1 adjective /ˈhɔː.ti/

Haughty

Meaning
arrogantly superior and disdainful; showing excessive pride
Example
She gave him a haughty look and walked away.
C1 noun /ˈhed.weɪ/

Headway

Meaning
forward movement or progress, especially when this is slow or difficult
Example
Despite the challenges, the research team made significant headway in developing the new vaccine.
C1 noun /ˈhæm.lət/

Hamlet

Meaning
a small rural settlement, smaller than a village; a small community
Example
The tiny hamlet nestled in the valley had only a dozen houses and one small church.
C1 noun ˈhaɪ.drə.dʒən ˈpaʊ.əd bʌsɪz

hydrogen-powered buses

Meaning
Buses powered by hydrogen fuel cells that produce only water vapor as emission.
Example
Hydrogen-powered buses reduce air pollution.
C1 verb /ˈhʌsəl/

hustle

Meaning
to move quickly and energetically; to push or work hard to achieve something
Example
She had to hustle to finish the project on time.
C1 adjective /ˈhæɡ.ərd/

Haggard

Meaning
looking exhausted and unwell, especially from fatigue, worry, or suffering
Example
After working three nights without sleep, he looked haggard.
C1 noun /ˈhaɪdəweɪ/

hideaway

Meaning
A place used as a retreat or a place to hide.
Example
The cabin in the woods was their secret hideaway.
C1 adjective /ˌhæpi ɡoʊ ˈlʌki/

happy-go-lucky

Meaning
cheerfully unconcerned about the future; carefree
Example
She has a happy-go-lucky attitude and never worries about tomorrow.
C1 verb /ˈhæmpər/

hamper

Meaning
to hinder or impede the movement or progress of
Example
The heavy rain hampered our travel plans.
C1 noun /helm/

Helm

Meaning
a tiller or wheel for steering a ship or boat; a position of leadership or control
Example
The experienced captain took the helm and expertly navigated the ship through the storm.
C1 noun /haɪˈeɪtəs/

hiatus

Meaning
A pause or break in continuity of a process or activity.
Example
The show returned after a long hiatus.
C1 verb /ˈhɪpnətaɪz/

hypnotize

Meaning
to put someone into a state of hypnosis; to influence someone's mind deeply
Example
The magician tried to hypnotize the audience.
C1 adjective /ˌhɒməˈdʒiːniəs/

homogeneous

Meaning
Of the same kind; alike.
Example
The team was not homogeneous in their skills.
C1 adjective ˌhaɪ.pəˈθet.ɪ.kəl

hypothetical

Meaning
Based on or serving as a hypothesis; supposed but not necessarily real or true.
Example
The discussion was based on hypothetical scenarios.
C1 noun (plural) /ˈhɪntərlændz/

hinterlands

Meaning
Plural of hinterland; remote or less developed regions.
Example
Explorers traveled deep into the hinterlands of the country.
C1 noun /ˌhɑːmənaɪˈzeɪʃən/

harmonization

Meaning
The process of making things compatible or consistent with one another.
Example
The harmonization of different policies ensures consistent results.
C1 verb /hoʊn/

hone

Meaning
To sharpen a blade or to improve a skill through practice.
Example
She honed her presentation skills before the big meeting.
C1 noun /ˈhɜː.mɪt/

Hermit

Meaning
a person living in solitude as a religious discipline; someone who withdraws from society
Example
The old hermit lived alone in a small cabin deep in the mountains, away from civilization.
C1 verb /ˈhaɪtən/

heighten

Meaning
to make or become greater in intensity or degree
Example
The announcement served to heighten the excitement in the room.
C1 noun /ˈhɛzɪtəns/

hesitance

Meaning
The quality or state of being reluctant or uncertain.
Example
Her hesitance to speak up delayed the decision.
C1 noun /haɪˈpɒtənjuːs/

hypotenuse

Meaning
the longest side of a right-angled triangle, opposite the right angle.
Example
In a right triangle, the hypotenuse is always longer than the other two sides.
C1 adjective /hɪpˈnɒtɪk/

hypnotic

Meaning
Producing sleep or a trance-like state; mesmerizing.
Example
The music had a hypnotic effect on the audience.
C1 noun /hɪˈstɪəriə/

hysteria

Meaning
An uncontrollable outburst of emotion or fear, often characterized by irrational behavior.
Example
The crowd was in a state of hysteria during the concert.
C1 noun /ˈhæv.ək/

Havoc

Meaning
widespread destruction; great confusion or disorder; chaos
Example
The hurricane wreaked havoc on the coastal towns, destroying homes and businesses.
C1 verb /ˈheɪsən/

hasten

Meaning
To move or act quickly; to cause something to happen sooner.
Example
He hastened to finish his work before the deadline.
C1 noun ˌhaɪ.pɚˈten.ʃən

hypertension

Meaning
Abnormally high blood pressure.
Example
High sodium intake leads to hypertension.
C1 adjective /haɪˈdrɔːlɪk/

hydraulic

Meaning
operated by the pressure of liquid, especially water or oil
Example
The mechanic repaired the hydraulic system of the machine.
C1 adjective /ˈhæloʊd/

hallowed

Meaning
regarded as holy or greatly respected
Example
They walked across the hallowed halls of the old university.
C1 noun /ˈhɔːl.mɑːrk/

hallmark

Meaning
a typical characteristic or feature of someone or something
Example
Honesty is the hallmark of a good leader.
C1 noun /ˈɛər.luːm/

heirloom

Meaning
a valuable object that has belonged to a family for several generations
Example
The ring is a family heirloom passed down from her grandmother.
C1 noun ˈhɪn.drəns

hindrance

Meaning
Something that creates difficulties or delays in progress.
Example
Lack of funds was a major hindrance to the project.
C1 noun /ˈhɒrəˌskoʊp/

horoscope

Meaning
A forecast of a person's future based on the positions of the stars and planets at their birth.
Example
She read her horoscope every morning to see what the stars predicted.
C1 adjective /ˈhæpləs/

hapless

Meaning
unfortunate, unlucky, deserving pity
Example
The hapless traveler lost his passport on the very first day.
C1 noun /hɪm/

hymn

Meaning
A religious song or poem of praise to God or a deity.
Example
The congregation sang a hymn during the morning service.
C1 adjective /hɔːrs/

Hoarse

Meaning
rough or harsh in sound; having a rough voice from shouting or illness
Example
His voice became hoarse after shouting at the concert.
C1 adverb /ˈhɒtli/

hotly

Meaning
in an intense, angry, or passionate way
Example
She hotly denied the accusations.
C1 noun /ˈhɛksəˌɡɒn/

hexagon

Meaning
A six-sided polygon.
Example
A honeycomb cell is shaped like a hexagon.
C1 adverb /ˈhʌŋ.ɡrə.li/

Hungrily

Meaning
in a way that shows hunger; greedily; eagerly
Example
The dog ate hungrily after not eating for hours.
C1 noun ˈhʌz.bən.dri

husbandry

Meaning
The care, cultivation, and breeding of crops and animals; farming and agriculture.
Example
Proper husbandry techniques improve livestock health.
C1 noun /hɪˈpɑː.krə.si/

Hypocrisy

Meaning
the practice of claiming to have moral standards that one does not actually possess; insincerity
Example
His hypocrisy was exposed when he criticized others for the same mistakes he had made.
C1 noun /huːf/

Hoof

Meaning
the hard part covering the foot of horses, cattle, sheep, and other animals
Example
The horse's hoof was injured after stepping on a sharp rock.
C1 noun /ˈheɪˌdeɪ/

heyday

Meaning
The period of greatest success, popularity, or power.
Example
In its heyday, the company dominated the market.
C1 noun /ˌhaɪ.roʊˈɡlɪf.ɪks/

hieroglyphics

Meaning
a system of writing using pictures or symbols, used especially by ancient Egyptians
Example
The tomb walls were covered with Egyptian hieroglyphics.
C1 noun /ˈhaɪ.drəʊˌpaʊər ˌdʒen.əˈreɪ.ʃən/

hydropower generation

Meaning
The production of electrical power through the use of the gravitational force of falling or flowing water.
Example
Hydropower generation promotes green energy.
C1 adjective /ˌhɪpəˈkrɪtɪkəl/

Hypocritical

Meaning
behaving in a way that contradicts one's stated beliefs or values
Example
It's hypocritical to preach honesty while lying yourself.
C1 verb /ˈhjuːmənaɪz/

humanize

Meaning
To make something more humane, kind, or relatable.
Example
The teacher tried to humanize the lesson with personal stories.
C1 noun /ˈhɪntərlænd/

hinterland

Meaning
The remote or less developed areas away from the coast or a city.
Example
The farmers came from the rural hinterland to sell their produce in the city.
C1 noun /heɪz/

Haze

Meaning
a slight obscuration of the lower atmosphere, typically caused by fine suspended particles; confusion
Example
The morning haze lifted gradually as the sun rose higher in the sky.
C1 verb /hiːd/

heed

Meaning
to pay attention to; to take notice of
Example
You should heed the teacher's advice.
C1 noun /ˈhɪr.seɪ/

Hearsay

Meaning
information received from other people that one cannot adequately substantiate; rumor
Example
The accusations were based on hearsay rather than concrete evidence or eyewitness testimony.
C1 noun /ˈherən/

Heron

Meaning
large wading bird with long legs and neck that feeds on fish
Example
The heron stood motionless by the water's edge, waiting for fish.
C1 noun /ˈheəˌkʌtər/

haircutter

Meaning
a person whose job is to cut and style hair; barber or hairdresser
Example
The haircutter gave me a neat and stylish haircut.
C1 adjective /hjuːˈmeɪn/

humane

Meaning
Showing compassion or benevolence.
Example
The doctor provided humane treatment to the injured animals.
C1 noun /ˈhæŋ.ər/

Hanger

Meaning
a shaped piece of wood, plastic, or metal with a hook at the top, used to hang up clothes
Example
She hung her dress on a wooden hanger to prevent it from getting wrinkled.
C1 noun /hjuːˈmɪl.ɪ.ti/

humility

Meaning
The quality of having a modest or low view of one's importance.
Example
She accepted the award with grace and humility.
C1 noun /ˈhaɪbrɪd/

hybrid

Meaning
a mixture of two different things, often combining the best qualities of both
Example
The car is a hybrid that runs on both electricity and fuel.
C1 adjective /ˈhɑːrtˌrɛndɪŋ/

heartrending

Meaning
Causing great sadness or distress; very moving emotionally.
Example
The documentary showed heartrending scenes of war victims.
C1 noun /haʊnd/

Hound

Meaning
a dog bred for hunting, typically having a keen sense of smell
Example
The bloodhound tracked the scent through the dense forest.
C1 adjective /ˌhaɪəˈrɑː.kɪ.kəl/

hierarchical

Meaning
arranged in order of rank or authority
Example
The company has a strict hierarchical structure.
C1 adjective /ˌhɔːrtɪˈkʌltʃərəl/

horticultural

Meaning
Relating to the art or practice of garden cultivation and management.
Example
She studied horticultural science at the university.
C1 noun /ˈhjuːbrɪs/

hubris

Meaning
excessive pride or self-confidence
Example
His hubris led to his downfall.
C1 adjective /ˈhɛlθfəl/

healthful

Meaning
Promoting good health; beneficial to health.
Example
A healthful diet includes fresh fruits and vegetables.
C1 noun /ˈhiːdənɪst/

hedonist

Meaning
A person who believes that the pursuit of pleasure is the most important thing in life.
Example
She was called a hedonist because she always prioritized enjoyment over duty.
C1 adjective /ˌhɛtərəˈʤiːniəs/

heterogeneous

Meaning
consisting of different kinds or diverse elements
Example
The classroom was filled with a heterogeneous group of students.
C1 noun /ˈhɪpnətɪzəm/

hypnotism

Meaning
The practice or act of inducing hypnosis.
Example
He studied hypnotism as part of his psychology degree.
C1 noun /ˌhoʊmiˈɑːpəθi/

homeopathy

Meaning
a system of alternative medicine based on treating diseases with highly diluted substances
Example
He believes in homeopathy for treating common colds.
C1 phrase ˌhjuː.məˈnɪt.ər.i.kəˈtæs.trə.fi

humanitarian catastrophe

Meaning
A widespread disaster affecting human life, health, and well-being on a large scale.
Example
The war created a humanitarian catastrophe.
C1 noun /ˈhæŋ.ər/

Hangar

Meaning
a large building with extensive floor area, typically for housing aircraft; an aircraft shelter
Example
The airplane was stored safely in the hangar during the severe thunderstorm.
C1 adjective /ˈheɪ.nəs/

Heinous

Meaning
extremely wicked or evil; abominable; morally reprehensible
Example
The heinous crime shocked the entire community.
C1 adverb/noun /ˌhɪərˈæftər/

hereafter

Meaning
from now on; in the future; also refers to life after death.
Example
Hereafter, all reports must be submitted electronically.
C1 noun /hɪpˈnoʊsɪs/

hypnosis

Meaning
A trance-like state of consciousness usually induced by suggestion.
Example
She underwent hypnosis to overcome her fear of flying.
C1 noun /ˈhʌbʌb/

hubbub

Meaning
a loud noise caused by a crowd of people talking or shouting
Example
There was a hubbub in the market as the sale began.
C1 noun/verb /ˈhɛrəld/

herald

Meaning
A person or thing that announces or signals the approach of something; to announce or signal.
Example
The blooming flowers herald the arrival of spring.
C1 adverb /ˌhɛdˈfɜrst/

headfirst

Meaning
With the head leading; in a reckless or hasty manner.
Example
He dived headfirst into the pool.
C1 noun /ˈhɔː.kər/

Hawker

Meaning
a person who travels about selling goods, typically from door to door or on the street
Example
The hawker sold fresh fruits from his cart.
C1 noun /ˈhɒl.ə.kɔːst/

holocaust

Meaning
A large-scale destruction, especially by fire; historically, the genocide of Jews during World War II.
Example
Millions of people perished during the Holocaust.
C1 noun /hɔːrd/

horde

Meaning
A large group or crowd, especially one that is disorderly or difficult to control.
Example
A horde of fans gathered outside the stadium.
C1 noun /ˈhɛrəsi/

heresy

Meaning
belief or opinion that goes against established religious doctrine or accepted beliefs.
Example
In medieval times, heresy was often punished severely.
C1 noun /haɪˈpɜːrbəli/

hyperbole

Meaning
Exaggerated statements or claims not meant to be taken literally.
Example
Saying he could run a thousand miles in a day is pure hyperbole.
C1 noun ˌhaɪ.droʊˈpɒn.ɪks

hydroponics

Meaning
Growing plants using nutrient-rich water instead of soil.
Example
Hydroponics allows crops to grow without soil.
C1 adjective /ˈheɪ.zi/

Hazy

Meaning
covered with haze; unclear or vague; lacking clarity
Example
The mountain tops were hazy in the morning mist.
C1 noun /hʌl/

hull

Meaning
The outer covering of a seed or fruit; also the main body of a ship.
Example
The sailors inspected the ship’s hull for any damage.
C1 adjective /ˈhɑːrdi/

hardy

Meaning
Strong, robust, and capable of enduring difficult conditions.
Example
Hardy plants can survive the harsh winter.
C1 verb /hɜːrl/

hurl

Meaning
To throw something with great force.
Example
The boy hurled a stone into the river.
C1 verb /ˈhaɪbərˌneɪt/

hibernate

Meaning
To spend the winter in a dormant state, as some animals do.
Example
Bears hibernate in caves during the winter.
C1 verb /həˈluːsɪneɪt/

hallucinate

Meaning
to see, hear, or sense things that are not actually present, often due to illness or drugs
Example
After taking the medicine, he began to hallucinate strange shapes.
C1 noun /ˈhɪp.ə.krɪt/

Hypocrite

Meaning
a person who acts in contradiction to their stated beliefs or feelings; a pretender
Example
Don't be a hypocrite by demanding honesty from others while lying yourself.
C1 noun /hoʊks/

Hoax

Meaning
a humorous or malicious deception; something intended to trick or deceive people
Example
The news about aliens landing turned out to be an elaborate hoax created by pranksters.
C1 adjective /ˈhɛdˌstrɔŋ/

headstrong

Meaning
Determined to do what one wants, even if it is not sensible.
Example
The headstrong child refused to listen to anyone.
C1 adjective /hɜːrˈbɪv.ər.əs/

Herbivorous

Meaning
feeding on plants; plant-eating
Example
Cows are herbivorous animals that graze on grass.
C1 noun /ˈhɑː.mɪ.saɪd/

Homicide

Meaning
the deliberate and unlawful killing of one person by another; murder
Example
The detective was assigned to investigate the homicide that occurred downtown last night.