Synonyms of unpredictable

1 Syllable

yoyo

2 Syllables

wacky, fickle, fluky, iffy, dicey, wiggly, balkier, schizo, chancier, fluctuant, chance, wayward, dicier, touchy, balky, aimless, wackiest, touchier, random, chancy, wackier, doubtful, yo-yo, fickler, touchiest, zillion

3 Syllables

mercurial, erratic, tottery, unsettled, incongruous, tottering, inconstant, unguided, capricious, hesitant, hot-and-cold, unprompted, vagarious, unstable, touch-and-go, contingent, fluctuating, whimsical, surprising, vacillant, variable, quicksilver, hare-brained, changeable, unfixed, uncertain

4 Syllables

unreliable, shillyshally, humorsome, reversible, unlooked-for, unpredicted, uncountable, uncareful, unexpected, impulsive, disconsonant, permutable, revocable, bubbleheaded, inconsistent

5 Syllables

unforeseeable, irresponsible, temperamental, unmeditated, incomputable, unreckonable, undependable, negativistic, incalculable, commutative