Related Clues:

• Slack-jawed
• Dumbstruck
• Cowed
• Impressed mightily
• Knocked for a loop
• Knocked the socks off of
• Impressed, and how!
• Dumb-struck
• At a loss for words
• Amazed
• Wowed
• Really impressed
• Greatly impressed
• Inspired mightily
• Dazzled