"telltale" in the noun sense
1. tattletale, tattler, taleteller, talebearer, telltale, blabbermouth
someone who gossips indiscreetly
"telltale" in the adjective sense
1. revealing, telling, telltale
disclosing unintentionally something concealed
"a telling smile"
"a telltale panel of lights"
"a telltale patch of oil on the water marked where the boat went down"
Source: WordNet® (An amazing lexical database of English)
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