adjective
1.
Synonyms: invincible 1, impregnable, inconquerable, indomitable, inexpugnable, invulnerable, unassailable, unbeatable, undefeatable
Related Word: insuperable, unsurmountable; proof, resistant, secure, tight
Idioms: more than a match for
Contrasted words: beatable, vincible; expugnable, pregnable, vulnerable; insecure, open, unprotected
Antonyms: conquerable
2.
Synonyms: insuperable , impassable, inconquerable, indomitable, insurmountable, invincible, unsurmountable
Antonyms: conquerable