from Wiktionary, Creative Commons Attribution/Share-Alike License
- adv. In a felonious manner; in a manner that constitutes a felony.
from The Century Dictionary and Cyclopedia
- In a felonious manner; wickedly; with deliberate intent to commit a wrongful act, the act being in law such as constitutes a crime of the class termed felonies. Indictments for capital offenses must state the act to have been done feloniously.
felonious + -ly (Wiktionary)