hateful; odious; abominable; totally reprehensible: a heinous offense.

1325–75; Middle English heynous < Middle French haineus, equivalent to haine hatred (derivative of haïr to hate < Germanic) + -eus -ous

heinously, adverb
heinousness, noun
nonheinous, adjective
nonheinously, adverb
nonheinousness, noun

wicked, infamous, flagrant, flagitious, atrocious, villainous, nefarious.

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
heinous (ˈheɪnəs, ˈhiː-)
evil; atrocious
[C14: from Old French haineus, from haine hatred, from hair to hate, of Germanic origin; see hate]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

late 14c., from O.Fr. haineus (Fr. haineux), from haine "hatred," from hair "to hate," from Frankish *hatjan (cf. O.S. haton, O.E. hatian "to hate").
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The most heinous crime of all is to forget to replace a record in its cover
  immediately after use.
Paul betrays the family's trust with a heinous act.
The criminal at the heart of bestseller Margolin's unsatisfying 10th thriller
  is particularly heinous.
There is no evidence to suggest that a video game drives people to commit
  heinous crimes.
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