ἄμαχος
Etym. μάχη
"without battle":
I. of a person, "with whom no one fights, unconquered, unconquerable, invincible", Hdt., etc.; of places, "impregnable", id=Hdt.; of things, "irresistible", Pind., Aesch.
II. act. "not having fought, taking no part in the battle", Xen.
2. "disinclined to fight, peaceful", Aesch.: "not contentious", NTest.