Related Clues:

• 'Holy Toledo!'
• 'Gosh!'
• 'I didn't know that!'
• 'I don't believe it!'
• Lacking substance
• Cousin of 'hmmm!'
• 'My stars!'
• 'Gosh, will you look at that!'
• Fantastic
• 'Heavens!'
• 'That's incredible!'
• 'No kidding'
• 'Is that so!'
• Comment before 'I don't know'
• Knock the socks off