Romanian word invincibil comes from Latin ingratus (Thankless. Ungrateful. Unpleasant, disagreeable.), Latin vincibilis (Refutable. Vincible, conquerable.)

Detailed word origin of invincibil

Dictionary entry	Language	Definition
ingratus	Latin (lat)	Thankless. Ungrateful. Unpleasant, disagreeable.
vincibilis	Latin (lat)	Refutable. Vincible, conquerable.
invincibilis	Latin (lat)	Invincible, unconquerable. Irrefutable.
invincibil	Romanian (ron)	Invincible.