Related Clues:

• Knocked for a loop
• Stopped working
• Knocked the socks off of
• Impressed, and how!
• At a loss for words
• Amazed
• Wowed
• Really impressed
• Greatly impressed
• Struck with amazement
• Inspired mightily
• Dazzled
• Totally amazed
• Ready for the post office
• Thrown for a loop