Treachery

 VISVASA-GHATA

Treachery is faithlessness.

A treacherer is a traitor. There is no knife that cuts so sharply and with such poisoned blade as treachery. Violation of allegiance, confidence or plighted fact is treachery. Traitorous or perfidious conduct is treachery. A treacherous man is untrustworthy. 

He gives a specious and misleading impression. He puts on a good or fair appearance, but he is bad in character or nature. He betrays a trusted friend. He smiles and laughs, but cuts the throat in the end. You cannot place any confidence on a treacherous man. He is waiting for opportunities to plunder and kill you. He is deceptive. "Treacherous' respects a man's private relations; traitorous' his public relation to his country. He is a treacherous friend and a traitorous subject or citizen.

One may be treacherous to his enemies as well as his friends. One may be traitorous to his country by abstaining to lend that aid which is in his power. A soldier is traitorous who goes over to the side of the enemy against his country. A man is guilty of treasonable practices who attempts on the life of the ruler or aims at subverting his government. Kill this treacherousness by practising honesty, reliability and trustworthiness. 

Source: pg. 258, How to Cultivate Virtues and Eradicate Vices by Swami Sivananda