flummox /flumˈəks/ (informal)

To perplex or puzzle

• phrenesiac
• phrenesis
• phrenetic
• phrenetical
• phrenetically
• phrenic
• phrenism
• phrenisms
• phrenitic
• phrenitis
• phrenitises
• phrenologic
• phrenological
• phrenologically
• phrenologies
• phrenologise
• phrenologised
• phrenologises
• phrenologising
• phrenologist
• phrenologists
• phrenologize
• phrenologized
• phrenologizes
• phrenologizing