IPA: /ˈdʌlnəs/
KK: /dʌlnəs/
The state of being not sharp or not exciting; it can refer to a lack of brightness, interest, or quickness in understanding.
The dullness of the lecture made it hard for the students to stay awake.
Dullness → It is formed from "dull" (from Old English *dull*, meaning blunt or not sharp) and "-ness" (a suffix meaning the state or quality of). The word "dullness" refers to the state of being dull or lacking sharpness, brightness, or interest.
Think of the word 'dull' meaning not sharp or lacking brightness, and remember that 'dullness' describes the state of being dull.