A deceiver; a traitor.

figurative. A treacherous, deceitful, malicious, or pernicious person or thing (also as a term of abuse); the type of envy or treachery.

One who betrays any person that trusts him, or any duty entrusted to him; a betrayer. In early use often applied to Judas Iscariot.

= Iscariot, n.

A traitor. Obsolete.

A person who betrays his or her comrades or associates, frequently under the guise of friendship; a traitor, a betrayer. Cf. Iscariot, n.

A traitor; a betrayer.

Applied to a person; esp. in reference to the bird's monotonous call, or its habit of laying its eggs in the nests of other birds; also = fool…

One who misleads by false tales; a perfidious person; a deceiver or betrayer.

A deceiver, a traitor.

In other figurative or allusive uses. In allusion to the fable of the viper reared or revived in a person's bosom: One who betrays or is false to…

figurative. A treacherous, deceitful, or malicious person.

In figurative or allusive uses. With reference to the ingratitude or treachery displayed by the snake in Æsop's fable (1. x).

A traitor, a betrayer. Cf. traditor, n. 1. Obsolete. rare.

The surname of Judas, the disciple who betrayed Jesus Christ. Hence, an appellation for an accursed traitor. Also attributive.

Denoting a person or thing (with varying degrees of contempt or admiration). slang (chiefly U.S., Australian, and New Zealand). A person who…

A person who double-crosses another or others; a treacherous or duplicitous person, a swindler or cheat.

one who double-crosses or is unfaithful.