Definition of heinous adjective from the Oxford Advanced Learner's Dictionary

 

heinous

 adjective
adjective
BrE BrE//ˈheɪnəs//
 
; NAmE NAmE//ˈheɪnəs//
 
[usually before noun](formal) Immoral
 
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morally very bad a heinous crime See related entries: Immoral Word Origin late Middle English: from Old French haineus, from hair ‘to hate’, of Germanic origin.
See the Oxford Advanced American Dictionary entry: heinous