in·su·per·a·ble (ĭn-sōō'pər-ə-bəl) adj. Impossible to overcome; insurmountable: insuperable odds.
[Middle English, from Old French, from Latin īnsuperābilis : in-, not; see in-1 + superābilis, superable; see superable.] in·su'per·a·bil'i·ty, in·su'per·a·ble·ness n., in·su'per·a·bly adv.
c.1340, from L. insuperabilis "that cannot be passed over, unconquerable," from in- "not" + superabilis "that may be overcome," from superare "to overcome," from superus "one that is above," from super "over" (see super-).