1. Vapidness.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• validitiy,
• vailidity,
• valdity,
• valididy,
• varitity,
• validiity,
• validaity,
• validty,
• vaidity,
• vaildity,
• velidity,
• vanitity,
• supidity,
• valitity,
• validiety,
• lappidify,
• lapidify,
• lapidits,
• capidity,
• sapadity

The adjective form of the word "vapidity" is "vapid".

The plural of the "vapidity" can be the "vapidities".

The singular of the "vapidity" can be the "vapidity".