Related Clues:

• "I'm stumped"
• 'I dunno'
• "You win"
• "I'm clueless!"
• "No clue"
• "I haven't the foggiest!"
• "I haven't a clue"
• "Haven't the foggiest"
• ''Good question!''
• "I have no idea"
• 'Heck if I know'
• ''No idea''
• 'No idea!'
• ''I've no idea''
• ''I dunno''