murderous

[mur-der-uh s]

adjective

of the nature of or involving murder: a murderous deed.
guilty of, bent on, or capable of murder.
extremely difficult, dangerous, or unpleasant: murderous heat.

Origin of murderous

First recorded in 1525–35; murder + -ous
Related formsmur·der·ous·ly, adverbmur·der·ous·ness, nounnon·mur·der·ous, adjective
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British Dictionary definitions for murderous

murderous

adjective

intending, capable of, or guilty of murder
informal very dangerous, difficult, or unpleasanta murderous road
Derived Formsmurderously, adverbmurderousness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for murderous
adj.

1530s, a hybrid from murder + -ous. An Old English word for it was morðorhycgende. Related: Murderously; murderousness.

Online Etymology Dictionary, © 2010 Douglas Harper