An individual with loss for words, staring blankly with mouth open. Often clueless and/or confused.
Also used as two words: "slack jaw", "slack-jaw"
"When asked to calculate the tax, she stood there slackjawed."
"The slack-jawed prophet said nothing when asked about the future of man, thus answering the question with clarity"
"The Slack Jaw Prophets rocked the house"
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