Pembroke Castle was built to be invincible.
A superhero who cannot be killed is an example of someone who would be described as invincible.
Origin of invincibleMiddle English invyncyble ; from Middle French invincible ; from Classical Latin invincibilis: see in- and amp; vincible
Origin of invincibleMiddle English, from Old French, from Latin invincibilis : in-, not; see in–1 + vincibilis, conquerable; see vincible.
- in·vin′ci·bil′i·ty, in·vin′ci·ble·ness
(usually uncountable, plural invincibles)
From Middle French invincible, from Latin invincibilis (“unconquerable”), from in- (“not”) + vincibilis (“conquerable”), from vincere (“to conquer”).