unnecessary

The word “unnecessary” means not needed; more than is required. In plain terms, not needed — something you could do without.

“Unnecessary” is pronounced uhn-NEHS-uh-srih (/ʌnˈnɛs.əˌsɛɹ.i/ in IPA).

Here is “unnecessary” used in a sentence: “The doctor said the surgery was unnecessary and recommended physical therapy instead.”

The opposite of “unnecessary” — its antonyms — are necessary, needed, required and mandatory.

“Unnecessary” is an adjective.

“Unnecessary” is a fairly common word in modern English, usually learned at around the A2 level.

Both unnecessary and needless describe something that is not required, but needless often carries a stronger sense of avoidable harm or waste, as in "needless suffering." Unnecessary is the more neutral, everyday choice for anything that is simply more than is required.

Use unnecessary when something is not needed at all, and optional when something is a genuine choice that may still be worthwhile. Calling a step unnecessary suggests it can be dropped without loss, whereas optional simply means it is not mandatory.

"Not unnecessary" is grammatically correct but is a double negative that means the same as "necessary," usually in a cautious or understated way. For clarity, most writers prefer to say something is necessary or needed rather than not unnecessary.

Unnecessary is an adjective that describes a thing, as in "an unnecessary delay," while unnecessarily is the adverb form that describes an action or degree, as in "the process was unnecessarily slow." Choose unnecessary before a noun and unnecessarily before a verb or another adjective.