unnecessary

Anything that is extra or not needed is unnecessary. Wearing long underwear in July is an unnecessary precaution against being cold.

If you don't need something, it's unnecessary. You take an unnecessary risk if you get in the car and don't bother to fasten your seatbelt. Driving your car when you could ride a bike instead is an unnecessary use of gasoline. If you keep dropping you pen in class, your teacher might say, "That's unnecessary." Walking your dog with two leashes is definitely unnecessary. That's obvious, but lots of times it's hard to tell what's necessary and what's unnecessary.

Definitions of unnecessary
1

adj not necessary

Synonyms:
unneeded
inessential, unessential
not basic or fundamental
excess, extra, redundant, spare, supererogatory, superfluous, supernumerary, surplus
more than is needed, desired, or required
gratuitous, needless, uncalled-for
unnecessary and unwarranted
inessential
not absolutely necessary
spare
kept in reserve especially for emergency use
Antonyms:
necessary
absolutely essential
obligatory
morally or legally constraining or binding
essential
basic and fundamental
indispensable
not to be dispensed with; essential
essential, indispensable
absolutely necessary; vitally necessary
incumbent
necessary (for someone) as a duty or responsibility; morally binding
needed, needful, required, requisite
necessary for relief or supply
obligatory
required by obligation or compulsion or convention
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