Related Clues:

• 'What was that?'
• 'Imagine that!'
• Freakish
• Come again?
• 'What did you say?'
• Quite strange
• Unpaired
• Missing a few marbles
• Kind of duck
• Noncommittal response
• Like all primes but one
• Lacking a match
• 'Whazzat?'
• Atypical
• Quite unusual