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treachery

treach·er·y

treachery

 
pronunciation:
tre ch ri
part of speech: noun
inflections: treacheries
definition 1: violation of faith or allegiance; betrayal.
His treachery in cheating his own brother saddened their family.
synonyms:
betrayal, disloyalty, perfidy
antonyms:
allegiance, loyalty
similar words:
deceit, double-dealing, duplicity, guile, infidelity
definition 2: an act of betrayal or of disloyalty to one's country; treason.
His acts of treachery against his country will not go unpunished.
synonyms:
treason
antonyms:
loyalty
similar words:
apostasy, conspiracy, insurgence, insurrection, mutiny, rebellion, revolt, revolution, sedition, subversion