Synonyms of nugatory

2 Syllables
drossy, zipper, shucker, trifling, naysaying, trivial, coner, piddling, idlest, worthless, no-good, specious
3 Syllables
no-account, casuistic, low-ranking, meaningless, ill-founded, invalid, doubletalk, unmeaning, resultless, forceless, dissentient, time-wasting, useless, futile, doublespeak, slack-spined, reasonless
4 Syllables
negative, unimportant, privative, unnotable, unratified, unpurposed, defeasible
5 Syllables
insignificant, invertebrate, inconsequential, inadequate, unenforceable, ineffective, anticlimactic, inefficacious
6 Syllables
unaffirmative, inconsiderable