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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 n.
in·su′per·a·bly adv.
References in periodicals archive ?
The revelations disclosed by Al-Akhbar newspaper and WikiLeaks, which expose senior Amal figures expressing disquiet over Hezbollah's growing insuperability, would have come as little surprise to Nasrallah; diplomacy is predicated on duplicity and he knows well that the two parties are rarely in complete assent.
For weeks afterwards we walked, talked and worked like zombies, trying to function normally as best we could, still threatened by the probability of pursuit and further defeat at the hands of what seemed then to be an overwhelming power, our confidence in Rome's insuperability gone forever.