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Definition of judas : 1. The disciple who betrayed Christ. Hence: A treacherous person; one who betrays under the semblance of friendship.
2. Treacherous; betraying.

Synonyms:

fraud, a snake in the grass, Saint Jude, informer, apostate, St Jude, Judas Iscariot, hypocrite, serpent, recreant, double-crosser, ratfink, Thaddaeus, trust, double-dealer, snake, traitor, turncoat, fifth column, rat, betrayer, quisling, backstabber, Jude

Usage examples:

• It was twenty- five- thousand- francs," said Thuillier, dwelling on each word; " that was the sum paid to Judas." - "The Lesser Bourgeoisie", Honore de Balzac.
• Dryden's lines on Jacob Tonson the publisher:- With two left legs and Judas- coloured hair. - "The Works of Aphra Behn, Vol. I (of 6)", Aphra Behn.
• Judas had flung her from him. - "Mary Magdalen", Edgar Saltus.