"dulling" in the verb sense
make dull in appearance
"Age had dulled the surface"
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
make less lively or vigorous
"Middle age dulled her appetite for travel"
Source: WordNet® (An amazing lexical database of English)
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