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

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

Antonym: predictable

Encyclopedia: Unpredictable