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Definition of nugatory : 1. Of no force; inoperative; ineffectual.
2. Trifling; vain; futile; insignificant.

Synonyms:

null, insignificant, bad, small-fry, trivial, Mickey Mouse, ineffectual, unimportant, pathetic, vain, null and void, unavailing, empty, bootless, inconsiderable, niggling, of no account, inoperative, unprofitable, vapid, nonbinding, void, fruitless, inefficient, unreal, small-minded, nonvalid, defective, inconstant, incidental, foolish, faulty, useless, inadequate, deceitful, pointless, idle, delusive, baseless, worthless, futile, ineffective, petty, measly, profitless, shadowy, important, inconsequential, frivolous, fiddling, abortive, unserviceable, unsatisfying, invalid, purposeless, unsubstantial, visionary

teeny-weeny, miserly, delicate, slim, scanty, scrawny, picayune, diminutive, little, toy, pocket, stingy, modest, dwarfish, teensy, wee, itty-bitty, trifling, weeny, smallish, negligible, small, deficient, tiny, microscopic, meager, minor, teeny, piddling, compact, puny, spare, sparing, slight, short, niggardly, petite, paltry, baby, minute, bantam, miniature, scant, ungenerous, beggarly, minimal

Usage examples:

• Had their deliberate purpose been to render nugatory the expedition which- after innumerable vacillations and changes of purpose- they despatched to Portugal, they could hardly have acted otherwise than they did. - "With Moore At Corunna", G. A. Henty.
• Such establishments and calculations may appear very promising upon paper, but when applied to real life they will be found to be absolutely nugatory. - "An Essay on the Principle of Population", Thomas Malthus.
• His whole career will be rendered nugatory, and with his own hand he will crush to powder his life's work. - "Expositions of Holy Scripture Genesis, Exodus, Leviticus and Numbers", Alexander Maclaren.