Incapable of being conquered, overcome, or subdued; unconquerable; insuperable; as, an invincible army, or obstacle
If someone has an invincible belief or attitude, it cannot be changed. He also had an invincible faith in the medicinal virtues of garlic
If you describe an army or sports team as invincible, you believe that they cannot be defeated. When Sotomayor is on form he is virtually invincible. = unbeatable + invincibility in·vin·cibil·ity symbols of the invincibility of the Roman army
incapable of being overcome or subdued; "an invincible army"; "her invincible spirit"