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unexcogitable

adjective
un·​excogitable | \¦əˌnek¦skäjətəbəl\

Definition of unexcogitable 

: not capable of being thought out or contrived

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History and Etymology for unexcogitable

modification of Late Latin inexcogitabilis, from Latin in- in- entry 1 + excogitare to excogitate + -abilis -able

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