Etymology
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insurmountable (adj.)

1690s, from in- (1) "not, opposite of" + surmountable. Related: Insurmountably. Brachet calls French insurmontable a "ghastly philological monster."

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Definitions of insurmountable

insurmountable (adj.)
not capable of being surmounted or overcome;
insurmountable disadvantages
Synonyms: unsurmountable
insurmountable (adj.)
impossible to surmount;
Synonyms: insuperable
From wordnet.princeton.edu