| verb | reveal unintentionally “Her smile betrayed her true feelings” |
| verb | deliver to an enemy by treachery “Judas sold Jesus” |
| verb | disappoint, prove undependable to; abandon, forsake “His sense of smell failed him this time” |
| verb | be sexually unfaithful to one's partner in marriage “She cheats on her husband” |
| verb | give away information about somebody “He told on his classmate who had cheated on the exam” |
| verb | cause someone to believe an untruth “The insurance company deceived me when they told me they were covering my house” |
| betrayer | noun | one who reveals confidential information in return for money |
| betrayal | noun | an act of deliberate betrayal |
| cuckold | noun | a man whose wife committed adultery |
| rat | noun | one who reveals confidential information in return for money |
| ratter | noun | a disloyal person who betrays or deserts his cause or religion or political party or friend etc. |
| ratting | noun | to furnish incriminating evidence to an officer of the law (usually in return for favors) |
| shit | noun | a coarse term for defecation |
| snitch | noun | someone acting as an informer or decoy for the police |
| snitcher | noun | someone acting as an informer or decoy for the police |
| deceptive | adjective | causing one to believe what is not true or fail to believe what is true |
| deception | noun | the act of deceiving |
| deceiver | noun | someone who leads you to believe something that is not true |