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insurmountable

in·sur·mount·a·ble

insurmountable

pronunciation:
In sr maUn t bl
part of speech: adjective
definition: not capable of being conquered or overcome; not surmountable.
an insurmountable barrier
antonyms:
surmountable
similar words:
invincible
derivations: insurmountably (adv.), insurmountability (n.), insurmountableness (n.)