Put aside an invincibly ignorant Rick Perry or the antediluvian Ron Paul, who would abolish the Fed altogether.
early 15c., from Middle French invincible (14c.) or directly from Latin invincibilis "unconquerable," from in- "not" (see in- (1)) + vincibilis "conquerable," from vincere "to overcome" (see victor). Related: Invincibly. Noun meaning "one who is invincible" is from 1630s. Invincible ignorance is from Church Latin ignorantia invincibilis (Aquinas). Related: Invincibly.