Hei″nous (hā″nŭs), a. [OF. haïnos hateful, F. haineux, fr. OF. haïne hate, F. haine, fr. haïr to hate; of German origin. See Hate.] Hateful; hatefully bad; flagrant; odious; atrocious; giving great offense; — applied to deeds or to character.
It were most heinous and accursed sacrilege. Hooker.
How heinous had the fact been, how deserving
Contempt! Milton.
Syn. — Monstrous; flagrant; flagitious; atrocious.
— Hei″nous‐ly, adv. — Hei″nous‐ness, n.