humdinger /hum-dingˈər/ (slang)

1. An exceptionally excellent person or thing
2. A smooth-running engine
3. A swift vehicle or aircraft

• impregnated
• impregnates
• impregnating
• impregnation
• impregnations
• impregned
• impregning
• impregns
• impresa
• impresari
• impresario
• impresarios
• impresas
• imprescriptibility
• imprescriptible
• imprese
• impreses
• impress
• impresse
• impressed
• impresses
• impressibilities
• impressibility
• impressible
• impressing