Etymology
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unsurmountable (adj.)

"incapable of being overcome," 1701, from un- (1) "not" + surmountable.

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Definitions of unsurmountable

unsurmountable (adj.)
incapable of being surmounted or climbed;
Synonyms: unclimbable
unsurmountable (adj.)
not capable of being surmounted or overcome;
Synonyms: insurmountable
From wordnet.princeton.edu