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insuperable (adj.)

mid-14c., "unconquerable, incapable of being surmounted," from Old French insuperable (14c.) or directly from Latin insuperabilis "that cannot be passed over, unconquerable," from in- "not, opposite of" (see in- (1)) + superabilis "that may be overcome," from superare "to overcome," from superus "one that is above," from super "over" (from PIE root *uper "over"). Figurative use from 1650s. Related: Insuperably; insuperability.

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Definitions of insuperable from WordNet

insuperable (adj.)
impossible to surmount;
Synonyms: insurmountable
insuperable (adj.)
incapable of being surmounted or excelled;
insuperable odds
insuperable heroes
Synonyms: unconquerable
From wordnet.princeton.edu