Related Clues:

• Impress greatly
• Ginormous
• "Impressive!"
• Enormous (Pref.)
• Deal starter
• ''I'm amazed!''
• Prefix for byte
• Grand-scale (Pref.)
• "Holy guacamole!"
• ''Holy smoke!''
• ''That's impressive!''
• ''Unbelievable!''
• Prefix for phone or bucks
• "I'm amazed!"
• Hit prefix