inconceivable

from WordNet (r) 3.0 (2006)
inconceivable
    adj 1: totally unlikely [syn: {impossible}, {inconceivable},
           {out of the question}, {unimaginable}]
    
from The Collaborative International Dictionary of English v.0.48
Inconceivable \In`con*ceiv"a*ble\, a. [Pref. in- not +
   conceivable: cf. F. inconcevable.]
   Not conceivable; incapable of being conceived by the mind;
   not explicable by the human intellect, or by any known
   principles or agencies; incomprehensible; as, it is
   inconceivable to us how the will acts in producing muscular
   motion.
   [1913 Webster]

         It is inconceivable to me that a spiritual substance
         should represent an extended figure.     --Locke.
   -- {In`con*ceiv"a*ble*ness}, n. -- {In`con*ceiv"a*bly}, adv.
   [1913 Webster]

         The inconceivableness of a quality existing without any
         subject to possess it.                   --A. Tucker.
   [1913 Webster]
    
from Moby Thesaurus II by Grady Ward, 1.0
82 Moby Thesaurus words for "inconceivable":
      a bit thick, a bit thin, absurd, antic, barred, beguiling,
      bewildering, beyond belief, closed-out, contrary to reason,
      doubtable, doubtful, dubious, dubitable, enigmatic, exceptional,
      excluded, extraordinary, fabulous, fanciful, fantastic,
      fascinating, hard of belief, hard to believe, hopeless,
      implausible, impossible, incomprehensible, incredible,
      logically impossible, marvelous, mind-boggling, miraculous,
      not deserving belief, not possible, open to doubt,
      open to suspicion, outlandish, overwhelming, oxymoronic,
      paradoxical, passing belief, passing strange, phenomenal,
      preposterous, problematic, prodigious, prohibited, puzzling,
      questionable, rare, remarkable, ridiculous, ruled-out,
      self-contradictory, sensational, staggering, staggering belief,
      strange, striking, stupendous, suspect, suspicious, tall, thick,
      thin, unaccountable, unbelievable, unconvincing, unearthly,
      unexpected, ungodly, unheard-of, unimaginable, unique, unknowable,
      unprecedented, unthinkable, unworthy of belief, weak, wonderful,
      wondrous

    

[email protected]