English
heinously
From heinous + -ly.
A compound of heinous + -ly
Proto-Indo-European *keh₂d-
Frankish *hattjan
Old French haïr ‘to hate’
Anglo-Norman hainous
Middle English heynous ‘Heinous, reprehensible’
English heinous
Today it means
adv In a heinous manner.
Language periods are conventional ranges, not dates for this word.
Etymograph / heinously