Dictionary

inconceivable

adjective in·con·ceiv·able \ˌin-kən-ˈsē-və-bəl\

: impossible to imagine or believe : not conceivable

Full Definition of INCONCEIVABLE

:  not conceivable: as
a :  impossible to comprehend
b :  unbelievable
in·con·ceiv·abil·i·ty \-ˌsē-və-ˈbi-lə-tē\ noun
in·con·ceiv·able·ness \-ˈsē-və-bəl-nəs\ noun
in·con·ceiv·ably \-blē\ adverb

Examples of INCONCEIVABLE

  1. The fire caused an inconceivable amount of damage.
  2. After coming this far, to quit now would be inconceivable.

First Known Use of INCONCEIVABLE

1624

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