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Definitions

unnecessary

[uhn-nes-uh-ser-ee] / ʌnˈnɛs əˌsɛr i /
ADJECTIVE
not required
Synonyms
STRONGEST
avoidable futile gratuitous irrelevant needless redundant superfluous unneeded useless worthless
WEAK
accidental additional beside the point casual causeless chance dispensable excess exorbitant expendable extraneous extrinsic fortuitous haphazard inessential lavish noncompulsory nonessential optional prodigal profuse random supererogatory surplus uncalled-for uncritical undesirable unessential unrequired wanton
Antonyms
STRONGEST
necessary needed valuable worthwhile
WEAK
indispensable required

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

This allows the system to plan more effectively and avoid unnecessary trial and error.

From Science Daily • Apr. 5, 2026

He encouraged Australians to limit unnecessary fuel use and switch to public transport where possible.

From BBC • Apr. 4, 2026

Such seamless technologies teach us that repair and understanding is not our role and that such proficiency and knowledge is unnecessary.

From Slate • Apr. 4, 2026

The current requirement that lenders use three credit scores—known as tri-merge—is an anachronism and adds unnecessary costs to borrowers.

From The Wall Street Journal • Apr. 1, 2026

"I just thought maybe you could use it on whatever you want. Additional uniforms? Maybe some unnecessary and overpriced equipment?"

From "Fast Pitch" by Nic Stone