Essential skill or ability that cannot be done without; a crucial capability that is absolutely necessary.

Showing deep understanding or perceptiveness.

inappropriate; incorrect; not suitable

The state of being unable to move.

To regard or represent something as perfect or better than it really is.

plural form of index; statistical measures or reference points used for comparison

The practice of allowing oneself to enjoy the pleasure of something.

A natural way of behaving or reacting that does not require learning.

To put money, effort, time, etc. into something to make a profit or get an advantage.

to provide insurance; to make certain

Not likely to offend or provoke; harmless.

Impossible to travel along or over.

To recognize or establish who or what someone or something is.

Not able to exist or work together without conflict.

Showing a casual lack of concern; carefree.

the act of calling upon a higher power for help, blessing, or inspiration

the quality of being immoral; behavior that violates accepted moral standards

to breathe in; to draw air into the lungs

marking the beginning of something; first; opening

existing naturally in a person or animal; also related to reproduction within a limited community

Characterized by or given to introspection; examining one's own thoughts and feelings.

Not to be broken, violated, or infringed

fearless and adventurous, often used humorously

so extraordinary that it is hard to believe; amazing

the state of not being fully developed emotionally, mentally, or physically; lack of maturity

To bring upon oneself something undesirable, usually as a result of actions.

a device or environment that provides suitable conditions for eggs, cells, or infants to develop

to explain the meaning of something; to translate orally

to preserve the memory of someone or something forever

incapable of being corrected, improved, or reformed

lacking knowledge or awareness; uninformed

Lack of fairness or justice; unequal distribution or treatment.

Not exactly known, defined, or established; vague or uncertain.

Existing in something as a natural, permanent, or essential quality.

the state of being unable to do something

Without a doubt; certainly.

Relating to the intellect; a person who engages in critical thinking and study.

Defiance of authority; refusal to obey orders.

Not capable of being forced, compelled, or restrained.

Lacking perception, consciousness, or sensation.

Impossible to control or restrain.

Lacking thought; inconsiderate or thoughtless.

To examine one's own thoughts, feelings, or mental state.

too powerful to be defeated or overcome

The quality of bringing one into direct and instant involvement with something, giving rise to a sense of urgency or excitement.

Impossible to pass through or enter; impossible to understand.

Curious or eager to learn and ask questions.

Put a decision or plan into effect; carried out or executed.

a list of goods sent or services provided, with a statement of the sum due for these

freedom from punishment or harmful consequences for an action

the process of infecting or the state of being infected; a disease caused by germs

Proceeding in a gradual, subtle way but with harmful effects.

Unwilling or refusing to change one's views or to agree about something.

to make someone lose control of their faculties or behavior due to alcohol or drugs

to formally admit someone into a position, organization, or office

A person who tends to be shy and prefers spending time alone rather than in groups.

the act of intervening or pleading on behalf of another person

demanding something firmly and refusing to accept no

annoying or irritating

Absolutely necessary, essential

A conclusion reached on the basis of evidence and reasoning; logical deduction.

lack of respect; rudeness

the state of being seriously mentally ill; extreme foolishness or irrationality

The rapid development of industry that occurred in Britain in the late 18th and 19th centuries, brought about by the introduction of machinery and characterized by the use of steam power and the growth of factories.

unpleasantly cold, wet, or stormy (usually weather)

To involve oneself deeply in a particular activity or interest; to surround completely.

An act of asking for information; an investigation into something.

Located or occurring within a cell.

To fill someone with the urge or ability to do or feel something, especially creative or noble.

in a manner showing annoyance or restlessness due to delay or waiting

In disguise or with one's identity concealed.

The part of the digestive system where food is digested and absorbed, extending from the stomach to the anus.

treatment or circumstances that cause one to feel shame or loss of dignity; humiliation

to deprive someone or something of the ability or strength to function

To collapse or burst inward violently.

a written or spoken request to attend an event or to participate in something

To turn something upside down or in the opposite position, order, or direction.

to communicate or work together with someone or something

impossible to understand or interpret

to speak or act in a way that hurts someone's feelings or shows disrespect

Charming or flattering in a way intended to gain favor.

to shine light on something; to expose to radiation; to illuminate or brighten

To make something stronger, more extreme, or more forceful.

The quality or condition of feeling an irritating sensation on the skin that causes a desire to scratch.

A religious image or symbol, especially in the Eastern Orthodox Church.

Impossible to destroy or break.

to pierce or fix something with a sharp object

Unable to act in a relaxed and natural way, especially due to self-consciousness or restraint.

Not depending on another for livelihood or subsistence; free from outside control; not subject to another's authority.

Not clear or sharply defined; vague or blurred.

Extinct marine reptiles that resembled fish and dolphins, dominant during the Mesozoic era.

To make someone annoyed or angry; to cause discomfort or inflammation.

Alone or separated from others; having little or no contact with other people.

Situated within something; the inner part of something.

A person or thing regarded as a symbol of something, or a graphic symbol on a screen.

to form a mental image of; to believe something unreal to be true

Traveling from place to place, especially for work or duty.

unable to make decisions quickly; hesitant; wavering

Well known, respected, and admired for past achievements.

easily set on fire; flammable; combustible

without making careful distinctions; randomly; without discrimination

not logical or reasonable; lacking clear thought

Harm or damage to a person’s body caused by an accident or attack.

Excessively admiring or worshipping someone or something as an idol.

to include something as part of a whole; to form a corporation

contaminated; not clean; mixed with foreign substances

lacking good manners; rude; showing poor upbringing

Capable of being implied or suggested.

protected from disease or from the effects of something

close in friendship; private and personal; detailed knowledge

Done without being planned, organized, or rehearsed; spontaneous.

not stable; liable to change, collapse, or fail; lacking firmness or reliability

the emission of light from a hot object; brilliance

The dependence of two or more people or things on each other.

to such an extent

to include as a necessary part, or to engage someone in an activity

not showing due respect for another person; rude

Not important or significant; too small to matter.

A spoken curse or expression of strong condemnation.

Not clear or easy to understand; lacking logical connection.

The way in which two or more things have an effect on each other.