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.
[1913 Webster]
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.
[1913 Webster]