Felonious

Origin

From felony + -ous.

Full definition of felonious

Adjective

1. Of, relating to, being, or having the quality of felony; malignant; malicious; villainous; traitorous; perfidious.
• unknown date John Milton:O thievish Night,
  Why should'st thou, but for some felonious end,
  In thy dark lantern thus close up the stars?
2. (legal) Done with intent to commit a crime.felonious homicide

Derived terms

• feloniously
• feloniousness