flummox /flumˈəks/ (informal)

To perplex or puzzle

• underworked
• underworker
• underworkers
• underworking
• under-workman
• under-workmen
• underworks
• underworld
• underworlds
• underwrite
• underwriter
• underwriters
• underwrites
• underwriting
• underwritings
• underwritten
• underwrote
• underwrought
• undescendable
• undescended
• undescendible
• undescribable
• undescribed
• undescried
• undesert