TRAITOR

betrayer, double-dealer, two-timer, double-crosser, traitor

(noun) a person who says one thing and does another

traitor, treasonist

(noun) someone who betrays his country by committing treason

Source: WordNet® 3.1

Etymology

Noun

traitor (plural traitors)

Someone who violates an allegiance and betrays their country; someone guilty of treason; one who, in breach of trust, delivers their country to an enemy, or yields up any fort or place entrusted to his defense, or surrenders an army or body of troops to the enemy, unless when vanquished

Someone who takes arms and levies war against their country; or one who aids an enemy in conquering his country.

Hence, one who betrays any confidence or trust.

Synonyms: betrayer, fink

Verb

traitor (third-person singular simple present traitors, present participle traitoring, simple past and past participle traitored)

To act the traitor toward; to betray; to deceive.

Adjective

traitor (comparative more traitor, superlative most traitor)

traitorous

Source: Wiktionary

Trai"tor, n. Etym: [OE. traitour, OF. traïtor, traïteur, F. treître, L. traditor, fr. tradere, traditum, to deliver, to give up or surrender treacherously, to betray; trans across, over + dare to give. See Date time, and cf. Betray,Tradition, Traditor, Treason.]

1. One who violates his allegiance and betrays his country; one guilty of treason; one who, in breach of trust, delivers his country to an enemy, or yields up any fort or place intrusted to his defense, or surrenders an army or body of troops to the enemy, unless when vanquished; also, one who takes arms and levies war against his country; or one who aids an enemy in conquering his country. See Treason. O passing traitor, perjured and unjust! Shak.

2. Hence, one who betrays any confidence or trust; a betrayer. "This false traitor death." Chaucer.

Trai"tor, a.

Definition: Traitorous. [R.] Spenser. Pope.

Trai"tor, v. t.

Definition: To act the traitor toward; to betray; to deceive. [Obs.] " But time, it traitors me." Lithgow.

Source: Webster’s Unabridged Dictionary 1913 Edition