adjective
Synonyms: insuperable , impassable, inconquerable, indomitable, invincible, unconquerable, unsurmountable
Antonyms: surmountable
adjective
Synonyms: insuperable , impassable, inconquerable, indomitable, invincible, unconquerable, unsurmountable
Antonyms: surmountable
Merriam Webster. Collegiate thesaurus English vocabulary. Английский энциклопедический словарь тезаурус. 2003