felony (n.)youdaoicibaDictYouDict[felony 词源字典]
c. 1300, "treachery, betrayal; deceit; villainy, wickedness, sin, crime; violent temper, wrath; ruthlessness; evil intention," from Old French felonie (12c.) "wickedness, evil, treachery, perfidy, crime, cruelty, sin," from Gallo-Roman *fellonia, from fellonem "evil-doer" (see felon).

As a class of crime in common law, also from c. 1300, from Anglo-French. The exact definition changed over time and place, and even the distinction from misdemeanor or trespass is not always observed. In old use often a crime involving forfeiture of lands, goods, or a fee or a crime punishable by death. Variously used in the U.S.; often the sense is "crime punishable by death or imprisonment in a state penitentiary."[felony etymology, felony origin, 英语词源]
NapoleonyoudaoicibaDictYouDict
used in reference to various qualities and things associated with 19c. French emperors of that name, especially Napoleon I (Bonaparte) (1769-1821), such as a gold coin issued by his government and worth 20 francs. As a 12-pound artillery piece, in use in U.S. military from 1857 (in this case, from Napoleon III (1808-1873), under whose rule it was designed). As a type of boot, by 1860; as a card game, by 1876; as a type of rich cake, from 1892; as a type of good brandy, from 1930. The name also was applied by 1821 to anyone thought to have achieved domination in any field by ambition and ruthlessness. Napoleon complex in reference to aggressiveness by short people is attested by 1930. Related: Napoleonic.
ruthless (adj.)youdaoicibaDictYouDict
early 14c., from reuthe "pity, compassion" (see ruth) + -less. Ruthful (early 13c.) has fallen from use since late 17c. except as a deliberate archaism. Related: Ruthlessly; ruthlessness.