Related Clues:

• "I have no idea"
• 'Heck if I know'
• ''No idea''
• 'No idea!'
• ''I've no idea''
• ''I dunno''
• ''Dunno''
• Words accompanying a shrug
• 'Can't say'
• Unhelpful reply
• 'Don't ask me!'
• 'No idea whatsoever'
• ''I give up''
• 'You got me'
• 'I don't know the answer to this clue!'