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What is the opposite of optional?

Need antonyms for optional? Here's a list of opposite words from our thesaurus that you can use instead.

Adjective
Opposite of left to personal choice
“We have made it compulsory for first-year students to attend classes twice a week in the lab.”
Adjective
Opposite of of less than primary importance
“If the primary feature of a sports board game is dice, it's probably going to be unexciting.”
Adjective
Opposite of done deliberately through one's own volition after thorough consideration
Adjective
Opposite of outside of, or additional to, the normal educational curriculum or one's duties
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