"dulls" in the verb sense

1. dull

make dull in appearance

"Age had dulled the surface"

2. dull

become dull or lusterless in appearance lose shine or brightness

"the varnished table top dulled with time"

3. muffle, mute, dull, damp, dampen, tone down

deaden (a sound or noise), especially by wrapping

4. numb, benumb, blunt, dull

make numb or insensitive

"The shock numbed her senses"

5. dull, blunt

make dull or blunt

"Too much cutting dulls the knife's edge"

6. pall, dull

become less interesting or attractive

7. dull

make less lively or vigorous

"Middle age dulled her appetite for travel"

Source: WordNet® (An amazing lexical database of English)

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