Synonyms of unnecessary

2 Syllables

icer, pointless, lavish, random, zipper, gravier, deadwood, wanton, tipper, goalless, casual, surplus, idlest, worthless, fusser, needless, excess, chance

3 Syllables

redundant, causeless, optional, unneeded, low-ranking, stoppable, superfluous, extraneous, gingerbread, profuse, haphazard, useless, fortuitous, futile, prodigal, extrinsic, unhelpful, gratuitous

4 Syllables

avoidable, expendable, irrelevant, additional, dispensable, escapable, unrequired, unimportant, inessential, nonessential, uncritical, purposeless, nongermane, unessential, motiveless, uncalled-for, exorbitant, avertible, immaterial, accidental, undirected

5 Syllables

undesirable, noncompulsory

7 Syllables

supererogatory