1. Disgracefully or shamefully criminal; grossly wicked; scandalous; — said of acts, crimes, etc.
2. Guilty of enormous crimes; corrupt; profligate; — said of persons.
3. Characterized by enormous crimes or scandalous vices; as, “flagitious times.”
These men were reported to be heretics . . . , seducers of youth, and men of flagitious life.
– Isaac Taylor, History of the World