What is the opposite of unnecessary?

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

Adjective
Opposite of not needed or necessary
“They felt it was necessary to expurgate his letters before publishing them.”
Adjective
Opposite of surplus to requirements
“Even moderate exercise, such as walking, has real health benefits if you do it regularly all year round.”
Adjective
Opposite of capable of being prevented
“Yet he has a very short fuse, perhaps the inevitable result of coping with his high-pressure job.”
Adjective
Opposite of too bad to be justified, excused or tolerated
Adjective
Opposite of done to excess
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