Inconceivable Definition

ĭnkən-sēvə-bəl
adjective
Impossible to comprehend or grasp fully.
Inconceivable folly; an inconceivable disaster.
American Heritage
That cannot be conceived; that cannot be thought of, understood, imagined, or believed.
Webster's New World
So unlikely or surprising as to have been thought impossible; unbelievable.
An inconceivable victory against all odds.
American Heritage

Unable to be conceived, unbelievable.

Wiktionary
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