telltale
adj : disclosing unintentionally; "a telling smile"; "a telltale
panel of lights"; "a telltale patch of oil on the water
marked where the boat went down" [syn: revealing, telling,
telltale(a)]
n : someone who gossips indiscreetly [syn: tattletale, tattler,
taleteller, talebearer, blabbermouth]