Related Clues:

• Relative of 'Hmm ...'
• 'You could've knocked me over with a feather!'
• Command to a horse
• ''Omigosh!''
• Word from Beaver Cleaver
• Like all primes but one
• Lacking a match
• Fancy that!
• Wow!
• Atypical
• Relative of 'hmmm'
• Quite unusual
• Unmatched, as socks
• "You don't say!"
• 'I'll be darned!'