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.