Synonyms of unpredictable

Adjective

1. unpredictable (vs. predictable), aleatory, capricious, freakish, episodic, occasional, unforeseeable, uncertain

usage: not capable of being foretold

2. unpredictable, indeterminable (vs. determinable), undeterminable

usage: unknown in advance; "an unpredictable (or indeterminable) future"

3. irregular, unpredictable, sporadic (vs. continual)

usage: not occurring at expected times

Definition and meaning of unpredictable (Dictionary)