WordWeb Online

1. Disclosing unintentionally something concealed
   "a telltale panel of lights";
   - revealing, telling

1. Someone who gossips indiscreetly
   - tattletale [US], tattler, taleteller, talebearer, blabbermouth [informal], blabber [informal]
    
2. [Brit, informal] Someone who reports another person's wrongdoings to someone in authority
   "I told the teacher that I'm not a telltale and didn't want to get involved";
   - grass [Brit, informal], snitch [informal], tattletale [US, informal], talebearer [archaic], rat [informal], squealer [informal]

Derived forms: telltales

See also: informative, informatory

Type of: betrayer, blabber [informal], gossip, gossiper, gossipmonger, informer, newsmonger, rat [informal], rumormonger [US], rumourmonger [Brit, Cdn], squealer

Encyclopedia: Telltale, Incorporated