Related Clues:

• In a red state?
• Crackbrained
• Mentally unbalanced
• Out-of-sorts
• Fuming mad
• In a tiff
• Quite cross
• Rather more than miffed
• Mucho mad
• Spitting nails, so to speak
• Really peeved
• Boiling over
• Flushed with anger
• 'Are you ___?'
• Hatter's mental state?