treacherousness Copy link Outline I. Character of a treacherous person1. perfĭdia2. infĭdēlĭtas (faithlessness)II. Treacherous conduct1. perfĭdia2. prōdĭtio (act of betraying)3. fraus, dŏlus mălus, etc. • treacherousness: ; treachery: I. Character of a treacherous person: 1. perfĭdia: he was characterized by such t., tantae p. fuit, Suet. Ner. 5: in the midst of the general t. and unfairness of men, in tanta hominum p. et iniquitate, Cic. Fam. 1, 2, fin. 2. infĭdēlĭtas (faithlessness): Caes.: Cic. II. Treacherous conduct: 1. perfĭdia: to be guilty of t., p. admittere (in aliquem), Suet. Caes. 75: what t. you both showed towards Dolabella, quanta utriusque vestrum p. in Dolabellam, Cic. Ph. 2, 32, 79. Join: fraus et perfidia, Cic. 2. prōdĭtio (act of betraying): to get intelligence of anything by t., aliquid proditione excipere, Liv. 4, 30: acts of t. in friendship, amicitiarum proditiones, Cic. Ac. 2, 9. Join: perfidia, insidiae, proditio, Cic. 3. fraus, dŏlus mălus, etc.: v. dishonesty.