Invincible \In*vin"ci*ble\, a. [L. invincibilis: cf. F. invincible. See In- not, and Vincible.]

Incapable of being conquered, overcome, or subdued; unconquerable; insuperable; as, an invincible army, or obstacle.

Lead forth to battle these my sons Invincible. --Milton. -- In*vin"ci*ble*ness, n. -- In*vin"ci*bly, adv.

Source: Webster's Revised Unabridged Dictionary (1913)