adjective
1.
incapable of being conquered
the team proved to be invincible
Synonyms: impregnable, inconquerable, indomitable, inexpugnable, invulnerable, unassailable, unbeatable, unconquerable, undefeatable
Related Word: inviolable, untouchable; unattackable
Contrasted words: conquerable, subduable, surmountable, vanquishable
Antonyms: vincible
2.
Synonyms: insuperable , impassable, inconquerable, indomitable, insurmountable, unconquerable, unsurmountable
Antonyms: vincible