inconceivable

The definition of inconceivable is something that cannot be imagined or understood.

(adjective)

The idea that two die-hard enemies who will never ever make up could suddenly become best friends is an example of something that is inconceivable.

See inconceivable in Webster's New World College Dictionary

adjective

that cannot be conceived; that cannot be thought of, understood, imagined, or believed

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See inconceivable in American Heritage Dictionary 4

adjective

Impossible to comprehend or grasp fully: inconceivable folly; an inconceivable disaster.
So unlikely or surprising as to have been thought impossible; unbelievable: an inconceivable victory against all odds.

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