Related Clues:

• 'Who knows?!'
• ''I have no idea!''
• ''How should I know?''
• 'Hell if I know'
• ''Too technical!''
• Unhelpful answer
• 'I haven't the foggiest!'
• 'How should I know?'
• ''I'm stumped!''
• "No idea"
• 'Haven't the foggiest'
• 'Good question'
• [Shrug]
• "I dunno"
• 'I'm stumped'