1. Sedulousness.

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

• aedulity,
• zedulity,
• xedulity,
• dedulity,
• eedulity,
• wedulity,
• swdulity,
• ssdulity,
• sddulity,
• srdulity,
• s4dulity,
• seculity,
• seduilty,
• sedullity,
• sedulitey,
• sedullitey,
• sedulite,
• seduliety,
• sedoulity,
• sedulitiy

The adjective form of "sedulity" is "sedulous".

The plural form of the word "sedulity" is "sedulities"

The singular form of the word "sedulity" is "sedulity". It is already a singular noun.