telltale

adjective

a telltale blush spread over her face:

revealing, revelatory, suggestive, meaningful, significant, meaning, indicative;

unmistakable;

informal giveaway.

noun

“Steve did it, miss,” said a telltale:

North American tattletale;

informal blabbermouth, blabber, loud mouth, snitch, squealer;

British, informal sneak;

Scottish, informal clype;

Australian, New Zealand, informal pimp;

dated talebearer.