Bigmouthed

Part of speech: adjective

Definitions

1. Having a tendency to speak excessively or indiscreetly, often revealing information that should be kept private
2. Inclined to boast or share too much, sometimes exposing confidential thoughts or plans
3. Characterized by a habit of speaking out freely or without caution, leading to unintended disclosures

Etymology: "Bigmouthed" is a plain compound: "big" joined to "mouthed," the past-participle-style adjective built from "mouth." Its sense grew from the literal idea of a large mouth, which people have long linked with talking too much. The notion that a big mouth means a loose tongue is a familiar figure of speech, so the compound makes an obvious, transparent metaphor: the mouth is where speech comes out, and a large one suggests a large amount of it, along with a lack of restraint about what is said.

Synonyms: talkative, loquacious, garrulous

Antonyms: reserved, silent, taciturn