Synonyms of unavailing

1 Syllable
null, vain
2 Syllables
drossy, pointless, shucker, trifling, goner, aimless, failing, idle, trivial, idlest, worthless, fruitless, barren, no-good, empty, nuller, bootless, gainless, scrapper
3 Syllables
no-account, unguided, incongruous, resultless, forceless, useless, time-wasting, exhausted, valueless, futile, unthriving, slack-spined, hopeless
4 Syllables
abortive, inutile, unusable, nongermane, disconsonant, unnotable, unsanctioned, impractical, unsuccessful, nonfunctional, ineffectual, defeasible, unusuable, unfunctional
5 Syllables
invertebrate, unprofitable, irremediable, unproductive, ineffective, anticlimactic, inefficacious