CEFR Level
arousing distaste or opposition; unpleasant or offensive
"His objectionable behavior made everyone uncomfortable."
Required by law, rule, or custom; mandatory.
"Wearing a helmet is obligatory when riding a motorcycle."
To completely destroy, remove, or wipe out.
"The town was obliterated by the powerful earthquake."
The practice of following a custom, rule, or religious law.
"The festival is held in observance of a centuries-old tradition."
A building equipped for observing astronomical or meteorological events.
"The observatory is open to the public on weekends."
The state of being no longer useful or in fashion; becoming outdated.
"The rapid obsolescence of smartphones makes people upgrade frequently."
A doctor specializing in pregnancy, childbirth, and women's reproductive health.
"The obstetrician monitored the mother’s health throughout the pregnancy."
Something that blocks or gets in the way; the action of obstructing.
"There was an obstruction on the railway track."
deliberately creating difficulties or preventing progress; hindering or blocking something
"The obstructive policies hindered economic growth."
An incident, event, or something that happens.
"The occurrence of such storms is rare in this region."
The ongoing decrease in the pH of the Earth's oceans, caused by the absorption of carbon dioxide from the atmosphere.
"Ocean acidification is caused by atmospheric CO2 absorption."
present everywhere at the same time
"In the digital age, social media feels omnipresent in our lives."
eating both plants and animals
"Humans are generally considered omnivorous creatures."