Related Clues:

• 'Good question'
• [Shrug]
• "I dunno"
• Slangy "Beats me!"
• 'I'm stumped'
• "I'm stumped"
• 'Can't answer that'
• Shrugger's comment
• "I'm stumped!"
• 'I dunno'
• "You win"
• "I'm clueless!"
• I don't know, informally, about cashmere - frisk away
• Wearing cashmere? - I don't know, go ahead and frisk
• "No clue"