Related Clues:

• What a shrug might mean
• Too-seldom-heard reply
• 'I have no idea!'
• 'Beats me'
• Expression of bafflement
• -
• "How should I know?"
• "Who knows?"
• Clueless reply
• 'No clue'
• Comment made with a shrug
• 'I haven't the foggiest'
• "Beats me!"
• 'No idea'
• 'Who knows?!'