telltale

/ˈtɛlteɪl/

noun

One who divulges private information with intent to hurt others.
Similar: blabbermouth, gossip, rumormonger, talebearer
Tattletale; squealer.
An indicator, such as a warning light, that serves to warn of a hazard or problem.

adjective

Revealing something, especially something not intended to be known.
"He blushed when he approached, a telltale sign that he was happy to see him."

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