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unpredictable (adj.)

1840, from un- (1) "not" + predictable (adj.). Related: Unpredictably; unpredictability.

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Definitions of unpredictable from WordNet

unpredictable (adj.)
not capable of being foretold;
unpredictable (adj.)
unknown in advance;
an unpredictable (or indeterminable) future
unpredictable (adj.)
not occurring at a regular rate or fixed intervals;
Synonyms: irregular
From wordnet.princeton.edu