Vocabulary Cards
441 cards available.
C1 noun
observatory
Meaning
A building equipped for observing astronomical or meteorological events.
Example
The observatory is open to the public on weekends.
B1 verb
observe
Meaning
to watch carefully; to notice or perceive something
Example
Scientists observe the behavior of animals in the wild.
B2 verb
observed
Meaning
To celebrate or keep a religious or other festival.
Example
The day is observed annually to raise awareness.
B2 noun
observer
Meaning
a person who watches or notices something
Example
The observer took notes during the meeting.
C1 verb
obsess
Meaning
To preoccupy or fill the mind of someone continually and to an excessive degree.
Example
She tends to obsess over small details.
B2 noun
obsession
Meaning
An idea, thought, or concern that continually preoccupies or intrudes on a person's mind.
Example
His obsession with success drove him to work day and night.
C1 adjective
obsessive
Meaning
Relating to or characterized by an obsession; thinking about something too much.
Example
He has an obsessive interest in cleanliness.
C2 noun
obsidian
Meaning
A hard, dark, glasslike volcanic rock formed by rapid solidification of lava.
Example
The knife was made from sharp obsidian.
C1 noun
obsolescence
Meaning
The process of becoming obsolete or outdated and no longer used.
Example
The rapid advancement of technology leads to the obsolescence of old devices.
C2 adjective
obsolescent
Meaning
Becoming outdated or on the way to becoming obsolete.
Example
The obsolescent technology could not compete with modern devices.
C1 adjective
obsolete
Meaning
No longer in use or out of date.
Example
Floppy disks are now completely obsolete.
B1 noun
Obstacle
Meaning
something that blocks or makes progress difficult; a barrier
Example
Bad weather was the main obstacle to our journey.
B1 noun
obstacles
Meaning
Things that block one's way or prevent or hinder progress.
Example
Obstacles in life can often lead to valuable lessons.
C1 noun
obstetrician
Meaning
A doctor specializing in pregnancy, childbirth, and women's reproductive health.
Example
The obstetrician monitored the mother’s health throughout the pregnancy.
C2 noun
obstetrics
Meaning
The branch of medicine dealing with childbirth and care of women giving birth.
Example
She is studying obstetrics to become a specialist in childbirth.
C2 noun
obstinacy
Meaning
Stubborn refusal to change one's opinion or chosen course of action, despite attempts to persuade one to do so.
Example
His obstinacy made negotiations difficult.
C1 adjective
obstinate
Meaning
Refusing to change one's mind or accept others' advice easily.
Example
He remained obstinate despite the logical arguments.
C2 adjective
obstreperous
Meaning
Noisy and difficult to control.
Example
The obstreperous students disrupted the class.
C1 verb
obstruct
Meaning
to block or hinder progress; to prevent or impede movement
Example
The fallen tree obstructed the road for several hours.
C1 noun
obstruction
Meaning
Something that blocks or gets in the way; the action of obstructing.
Example
There was an obstruction on the railway track.
C2 noun
obstructionist
Meaning
a person who deliberately delays or prevents progress by being uncooperative or oppositional
Example
The obstructionist in the committee kept delaying the decision-making process.
C1 adjective
Obstructive
Meaning
deliberately creating difficulties or preventing progress; hindering or blocking something
Example
The obstructive policies hindered economic growth.
B2 verb
obtain
Meaning
to get or acquire something
Example
You need to obtain a visa before traveling abroad.
C2 verb
obtrude
Meaning
to force oneself or one's ideas into a situation uninvited or inappropriately
Example
He didn’t want to obtrude into their private conversation.