1. Stupidity; the quality of being dull.

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

• dilness,
• dullnees,
• dullnesse,
• dullnes,
• dullness,
• sulness,
• xulness,
• culness,
• rulness,
• eulness,
• dylness,
• dhlness,
• djlness,
• d8lness,
• d7lness,
• dukness,
• dupness,
• dulnesss,
• Duellness,
• Dwullness

• dullness.

The adjective form of the word "dulness" is "dull".

The plural of the "dulness" can be the "dulnesses".

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