adjective
incapable of being surmounted, overcome, or passed over
they met with insuperable difficulties
Synonyms: impassable, inconquerable, indomitable, insurmountable, invincible, unconquerable, unsurmountable
Related Word: unachievable, unattainable; unsurpassable; impenetrable, impregnable, invulnerable
Contrasted words: surmountable; achievable, negotiable
Antonyms: superable