noun
betrayal of a trust or confidence
corruption in public office is little short of treachery
Synonyms: disloyalty, faithlessness, perfidiousness, perfidy, treacherousness, treason; compare infidelity
Related Word: falseheartedness, falseness; double cross, double-dealing; sellout
Idioms: dirty pool, dirty work at the crossroads
Contrasted words: incorruptibility, reliability; probity, rectitude, uprightness; constancy, fidelity, loyalty, staunchness
Antonyms: dependability; trustworthiness