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Adjective: unbelievable  ,ún-bi'lee-vu-bul
  1. Beyond belief or understanding
    "at unbelievable speed";
    - incredible
     
  2. Having a probability too low to inspire belief
    - improbable, unconvincing, unlikely, doubtful

See also: astounding, believability, credibility, credibleness, dumbfounding, dumfounding, fabulous, flimsy, implausible, improbable, incredulous, marvellous [Brit, Cdn], marvelous [US], tall, unconvincing, undreamed, undreamed of, undreamt, undreamt of, unimagined, unthinkable

Encyclopedia: Unbelievable

Nearest

unbeatable
unbeaten
unbecoming
unbecomingly
unbecomingness
unbefitting
unbeholden
unbeknown
unbeknownst
unbelief
unbelievable
unbelievably
unbeliever
unbelieving
unbelievingly
unbeloved
unbelt
unbelted
unbend
unbendable
unbending