flummox /flumˈəks/ (informal)

To perplex or puzzle

• copiloted
• co-piloting
• copiloting
• co-pilots
• copilots
• coping
• copings
• coping-saw
• coping-saws
• coping-stone
• copious
• copiously
• copiousness
• copiousnesses
• cop it
• copita
• copitas
• cop it sweet
• coplanar
• coplanarities
• coplanarity
• cop off
• cop off with
• co-polymer
• copolymer