say it: TEL-tayl
telltale is a noun and adjective meaning "someone who gossips indiscreetly". It carries 2 recorded senses.
someone who gossips indiscreetly
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”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for telltale come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.