Synonyms of nonessential

2 Syllables

zipper, deadwood, gooky, trivial, petty, fluker

3 Syllables

causeless, unneeded, low-ranking, superfluent, superfluous, touching-up, extraneous, cosmetic, by-the-way, picayune

4 Syllables

expendable, excessive, residuary, dispensable, incidental, unrequired, unimportant, peripheral, inessential, supervenient, unessential, uncalled-for, adventitious

5 Syllables

insignificant, unnecessary

7 Syllables

supererogatory