What is the opposite of non-essential?

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

Adjective
Opposite of not absolutely necessary (tending to be less forceful in meaning than inessential)
Adjective
Opposite of not important or significant
Adjective
Opposite of coming after, less important than, or resulting from someone or something else that is primary
Adjective
Opposite of not relating to the most important part of something
Noun
Opposite of a thing on which too much money has been spent or which has used up too many resources
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