[verb] reveal unintentionally; "Her smile betrayed her true feelings" Synonyms:bewray
[verb] deliver to an enemy by treachery; "Judas sold Jesus"; "The spy betrayed his country" Synonyms:sell
[verb] disappoint, prove undependable to; abandon, forsake; "His sense of smell failed him this time"; "His strength finally failed him"; "His children failed him in the crisis" Synonyms:fail
[verb] be sexually unfaithful to one's partner in marriage; "She cheats on her husband"; "Might her husband be wandering?" Synonyms:cheat on, cheat, cuckold, wander
[verb] cause someone to believe an untruth; "The insurance company deceived me when they told me they were covering my house" Synonyms:deceive, lead astray