Open English Wordnet
Verbs
(v)betray, bewrayreveal unintentionally“Her smile betrayed her true feelings” (v)betray, selldeliver to an enemy by treachery“Judas sold Jesus”,
“The spy betrayed his country” (v)fail, betraydisappoint, 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” (v)deceive, betray, lead astraycause someone to believe an untruth“The insurance company deceived me when they told me they were covering my house”