Related Clues:

• Knocked for a loop
• Knocked the socks off of
• At a loss for words
• Amazed
• Wowed
• Really impressed
• Greatly impressed
• Inspired mightily
• Dazzled
• Thrown for a loop
• Thunderstruck!
• Really wowed
• Left speechless
• In amazement
• Thinking 'Gee whiz!'