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Adjective: unpredictable  ,ún-pri'dik-tu-bul
  1. Not capable of being foretold
  2. Unknown in advance
    "an unpredictable (or indeterminable) future"
  3. Not occurring at expected times
    - irregular

See also: aleatory, capricious, episodic, freakish, indeterminable, occasional, sporadic, uncertain, undeterminable, unforeseeable

Antonym: predictable

Encyclopedia: Unpredictable