Also found in: Thesaurus, Legal.
Impossible to overcome; insurmountable: insuperable odds.
[Middle English, from Old French, from Latin īnsuperābilis : in-, not; see in-1 + superābilis, superable; see superable.]
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|Adv.||1.||insuperably - to an insuperable degree; "these various courses all seemed insuperably difficult to the student"|