C14: from Old French haineus, from haine hatred, from hair to hate, of Germanic origin; see hate
heinous for learners of EnglishPowered by COBUILD (heɪnəs)
graded adjective & adjective [usu ADJ n]
If you describe something such as a crime as heinous, you mean that it is extremely evil or horrible. [formal] ⇒ Her life has been permanently blighted by his heinous crime. ⇒ They are capable of the most heinous acts.