from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Impossible to overcome; insurmountable: insuperable odds.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Impossible to achieve or overcome or be negotiated.
  • adj. Overwhelming or insurmountable.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Incapable of being passed over or surmounted; insurmountable.

from The Century Dictionary and Cyclopedia

  • Not superable; incapable of being passed over, overcome, or surmounted.
  • Synonyms Insurmountable, impassable, unconquerable, invincible.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. incapable of being surmounted or excelled
  • adj. impossible to surmount


Middle English, from Old French, from Latin īnsuperābilis : in-, not; see in-1 + superābilis, superable; see superable.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin insuperabilis (Wiktionary)



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