The Oxford Thesaurus An A-Z Dictionary of Synonyms - betrayaln.

1) treachery, treason, disloyalty, perfidy, traitorousness, faithlessness, bad faith, breach of faith: His delivery of the country into the hands of an invader was an outright act of betrayal. 2) revelation, divulging, disclosure, divulgence: People should not be led into betrayals of their secret opinions.