slack-jawed

[ slak-jawd ]
/ ˈslækˈdʒɔd /
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adjective

having the mouth open, especially as an indication of astonishment, bewilderment, etc.

Origin of slack-jawed

slack jaw + -ed3
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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Word Origin and History for slack-jawed

slack-jawed


adj.

1882, "over-talkative," from slack-jaw (n.) "impertinent language" (1797), from slack (adj.) + jaw (n.). Meaning "open-mouthed and speechless" from astonishment, stupidity, etc., is from 1905.

Online Etymology Dictionary, © 2010 Douglas Harper