quiddity /kwidˈi-ti/ or (archaic) quiddit /kwidˈit/

1. The inherent nature or essence of anything
2. Any trifling nicety
3. A quibble

quiddˈitātive adjective

• under penalty of
• underpeopled
• underperform
• underperformance
• underperformed
• underperforming
• underperforms
• underpin
• underpinned
• underpinning
• underpinnings
• underpins
• under plain cover
• underplant
• underplanted
• underplanting
• underplants
• underplay
• underplayed
• underplaying
• underplays
• underplot
• underplots
• underpopulated
• under-power