• Bellyaches
• Bitches
• Cavils
• Complains
• Complains chronically
• Continually finds fault
• Criticizes peevishly
• Criticizes unreasonably
• Finds fault
• Gripes
• Grouses endlessly
• Is a fault-finder
• Jumps verbally (on)
• Moans and groans
• Nitpicks
• Peevish complaints
• Quibbles