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

slack jaw + -ed3 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To slack-jawed's 21st Century Lexicon
Main Entry:  slack-jawed
Part of Speech:  adj
Definition:  having the mouth open, esp. in surprise'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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