Was wide open
Else clues• Appeared overwhelmed
• Betrayed amazement
• Couldn't hide one's astonishment
• Displayed a big mouth?
• Displayed astonishment
• Displayed boredom
• Expressed wonder
• Gawked
• Goggled
• Had a big mouth?
• Looked amazed
• Looked on in wonder
• Looked slackjawed
• Looked with amazement
• Opened wide
• Reacted to shocking news
• Rubbernecked
• Saw with awe
• Showed astonishment
• Showed awe
• Showed disbelief
• Showed shock
• Split wide open
• Stared
• Stared in amazement
• Stared in disbelief
• Stared in wonder
• Stared open-mouthed
• Stared openly
• Stared slack-jawed
• Stared stupidly
• Stared with dropped jaw
• Stared, as in wonder
• Used a beeper, then jaw dropped
• Was open-mouthed
• Was slack-jawed
• Was visibly awestruck
• Watched wide-eyed