inconceivable








adjective

  1. not conceivable; unimaginable; unthinkable
  2. unbelievable; incredible.

adjective

  1. incapable of being conceived, imagined, or considered
adj.

1630s, from in- (1) “not, opposite of” + conceivable. Related: Inconcievably. An Old English word for this was unasmeagendlic.

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