Slack-jawed Definition
adjective
(of a person) With the mouth in an open position and the jaw hanging loosely, especially as indicating bewilderment or astonishment.
Wiktionary
(idiomatic, of a person) Unsophisticated or unthinking; dimwitted in appearance.
Wiktionary
(idiomatic, dated, of a person) Overly talkative; indiscreet.
Wiktionary
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