insurmountable[adjective]Synonyms: insuperable, hopeless, impassable, impossible, invincible, overwhelming, unconquerable
Antonyms: surmountable
[TahlilGaran] English Synonym Dictionary ▲
in‧sur‧mount‧a‧ble /ˌɪnsəˈmaʊntəb
əl◂ $ -sər-/
adjective formal an insurmountable difficulty or problem is too large or difficult to deal with:
The language difference proved an insurmountable barrier. [TahlilGaran] Dictionary of Contemporary English ▲