Definition of "slack-jawed" [slack-jawed]

• With the mouth in an open position and the jaw hanging loosely, especially as indicating bewilderment or astonishment. (adjective)
• Unsophisticated or unthinking; dimwitted in appearance. (adjective)
• Overly talkative; indiscreet. (adjective)

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• "A+s who wakes each day with an outer-directed sense of purpose and Just-Do-It-ness that leaves Nike in the dust, and that infuriates some and leaves others standing slack-jawed at my speed, control and efficiency."
• "It was weird, introduced a potentially new character, but it kind of left me slack-jawed and saying, “Huh?”"
• "Remember that the principle is not simply entropic: the idea isn't to become a zombie, with chaos and clutter mounting around you as you sit bewildered and slack-jawed."