Definition of Felonious
A technical word of law which means done with intent to commit crime, i.e. criminal intent. Of the grade or quality of a felony, as, for example, a felonious assault (q.v.). Malicious; villainous; traitorous; malignant. Proceeding from an evil heart or purpose. Wickedly and against the admonition of the law; unlawfully. See also Felony; Feloniously
That's the definition of Felonious in Black's Law Dictionary 6th Edition. Courtesy of Cekhukum.com.