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Adjective: unthinkable  `ún'thing-ku-bul
  1. Incapable of being conceived or considered
    "From earthquakes to hurricanes, tidal waves to terrorist attacks, the unthinkable usually remains the unmentionable"

See also: impossible, inconceivable, incredible, out of the question, unbelievable, unimaginable, unthinkably

Antonym: thinkable

Nearest

untenanted
untended
Untermeyer
untested
untethered
unthankful
unthaw
unthawed
untheatrical
unthematic
unthinkable
unthinkably
unthinking
unthinkingly
unthought
unthoughtful
unthoughtfulness
unthought-of
unthread
unthreatening
untidily