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The Collaborative International Dictionary
Feloniousness

Felonious \Fe*lo"ni*ous\, a. Having the quality of felony; malignant; malicious; villainous; traitorous; perfidious; in a legal sense, done with intent to commit a crime; as, felonious homicide.

O thievish Night, Why should'st thou, but for some felonious end, In thy dark lantern thus close up the stars?
--Milton. -- Fe*lo"ni*ous*ly, adv. -- Fe*lo"ni*ous*ness, n.