slack-jawed

[slak-jawd]
adjective
having the mouth open, especially as an indication of astonishment, bewilderment, etc.

Origin:
slack jaw + -ed3

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Dictionary.com's 21st Century Lexicon
Main Entry:  slack-jawed
Part of Speech:  adj
Definition:  having the mouth open, esp. in surprise
Dictionary.com's 21st Century Lexicon
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Example sentences
Tourists walk slack-jawed from one opulent site to the next.
Eye catching design leaves local yokels slack-jawed.
The show's character-driven plot twists often leave viewers slack-jawed.
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