blabbermouth's Usage Examples:

You aren't giggly or a blabber mouth either, are you?She wasn't irresponsible, a blabbermouth or a liar – contrary to what both of them seemed to think.

She wasn't irresponsible, a blabbermouth or a liar – contrary to what both of them seemed to think.

But Will has left his broken lantern on the path - and the smugglers can't risk a blabbermouth.

Synonyms:

telltale, gossiper, tattler, taleteller, talebearer, tattletale, rumormonger, gossip, rumourmonger, newsmonger, gossipmonger,

Antonyms:

uninformative,