Pocket Thesaurus
Antonyms of unnecessary
accidental, additional, avoidable, beside the point, casual, causeless, chance, dispensable, excess, exorbitant, expendable, extraneous, extrinsic, fortuitous, futile, gratuitous, haphazard, inessential, irrelevant, lavish, needless, noncompulsory, nonessential, optional, prodigal, profuse, random, redundant, supererogatory, superfluous, surplus, uncalled-for, uncritical, undesirable, unessential, unneeded, unrequired, useless, wanton, worthless
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