WordWeb Online

1. Disclosing unintentionally
   "a telltale panel of lights"; "a telltale patch of oil on the water marked where the boat went down"
   - revealing, telling

1. Someone who gossips indiscreetly
   - tattletale [US], tattler, taleteller, talebearer, blabbermouth
    
2. [Brit] Someone who reports another person's wrongdoings to someone in authority
   - grass [Brit], snitch

Derived forms: telltales

See also: informative, informatory

Type of: gossip, gossiper, gossipmonger, newsmonger, rumormonger [US], rumourmonger [Brit, Cdn]

Encyclopedia: Telltale