Necessary

Antonyms of NECESSARY

evadable, additional, unsettled, dubious, uncertain, casual, trivial, useless, unclear, nonessential, unimportant, avertable, inconsequential, minor, unwanted, evitable, unreliable, chosen, contingent, questionable, unnecessary, improbable, inessential, shaky, gratuitous, undesired, preventable, undependable, avoidable, undecided, extra, unsure, unlikely, worthless, optional, secondary, needless, redundant, avertible, doubtful, insignificant, voluntary.