Synonyms of unexpected

1 Syllable

swift

2 Syllables

unmeant, startling, abrupt, casual, payback, swiftest, sudden, swifter, chance, stunning, speedball

3 Syllables

unwonted, barrelling, double-quick, fleet-footed, amazing, surprise, contingent, haphazard, unplanned, fortuitous, prodigious, fleetfooted, abnormal, impetuous, suddenness, wonderful, staggering, hot-and-cold, unusual, unprompted, atypic, ironic

4 Syllables

unintended, unprepared, unfamiliar, instantaneous, impulsive, unheralded, unlooked-for, unpredicted, aleatory, undesigned, accidental, astonishing, eye-opening, electrifying, unforeseen

5 Syllables

unordinary, heteromorphic, unforeseeable, unpredictable, unintentional, unimagined, precipitousness, unmeditated

6 Syllables

uninvestigated, unanticipated, uncharacteristic