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

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

quiddˈitātive adjective

• sinuately
• sinuation
• sinuations
• sinuitis
• sinuitises
• sinuose
• sinuosities
• sinuosity
• sinuous
• sinuously
• sinuousness
• sinuousnesses
• sinupallial
• sinupalliate
• sinus
• sinuses
• sinusitis
• sinusitises
• sinusoid
• sinusoidal
• sinusoidally
• sinusoids
• Siouan
• Sioux
• sip