1. comparative form of dull; less sharp, bright, interesting, or intelligent
Usage: comparative form

Examples

• This knife is duller than the one I used yesterday.
• The second movie was much duller than the first.
• Her hair looked duller after she stopped using conditioner.
• The paint became duller as it dried.
• He seemed duller and less energetic after his illness.
• The duller blade made cutting vegetables more difficult.