Related Clues:

• Off-key
• Flat as a piano?
• Like an off-pitch piano
• Out of key
• Out of key, as a piano
• Joanna should not be so ill-tempered!
• With no fixed pitch
• 'Here my only son / Knows not my feeble key of -- cares?' (The Comedy of Errors)
• A bit sharp, maybe
• (Of piano) not adjusted
• Flat, maybe