"duller" in the adjective sense
1. dull
lacking in liveliness or animation
"he was so dull at parties"
"a dull political campaign"
"a large dull impassive man"
"dull days with nothing to do"
"how dull and dreary the world is"
"fell back into one of her dull moods"
2. dull
emitting or reflecting very little light
"a dull glow"
"dull silver badly in need of a polish"
"a dull sky"
3. dull, muffled, muted, softened
being or made softer or less loud or clear
"the dull boom of distant breaking waves"
"muffled drums"
"the muffled noises of the street"
"muted trumpets"
4. boring, deadening, dull, ho-hum, irksome, slow, tedious, tiresome, wearisome
so lacking in interest as to cause mental weariness
"a boring evening with uninteresting people"
"the deadening effect of some routine tasks"
"a dull play"
"his competent but dull performance"
"a ho-hum speaker who couldn't capture their attention"
"what an irksome task the writing of long letters is"- Edmund Burke
"tedious days on the train"
"the tiresome chirping of a cricket"- Mark Twain
"other people's dreams are dreadfully wearisome"
5. dull
of color) very low in saturation highly diluted
"dull greens and blues"
6. dull
not keenly felt
"a dull throbbing"
"dull pain"
7. dense, dim, dull, dumb, obtuse, slow
slow to learn or understand lacking intellectual acuity
"so dense he never understands anything I say to him"
"never met anyone quite so dim"
"although dull at classical learning, at mathematics he was uncommonly quick"- Thackeray
"dumb officials make some really dumb decisions"
"he was either normally stupid or being deliberately obtuse"
"worked with the slow students"
8. dull, slow, sluggish
of business) not active or brisk
"business is dull (or slow)"
"a sluggish market"
9. dull
not having a sharp edge or point
"the knife was too dull to be of any use"
10. dull
blunted in responsiveness or sensibility
"a dull gaze"
"so exhausted she was dull to what went on about her"- Willa Cather
11. dull, thudding
not clear and resonant sounding as if striking with or against something relatively soft
"the dull thud"
"thudding bullets"
12. dull, leaden
darkened with overcast
"a dark day"
"a dull sky"
"the sky was leaden and thick"
Source: WordNet® (An amazing lexical database of English)
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