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adj. dull·er, dull·est
a. Arousing little interest; lacking liveliness; boring: a dull movie.
b. Not brisk or rapid; sluggish: Business has been dull.
2. Not having a sharp edge or point; blunt: a dull knife.
a. Not intensely or keenly felt: a dull ache.
b. Not bright, vivid, or shiny: a dull brown; a glaze with a dull finish.
c. Cloudy or overcast: a dull sky.
d. Not clear or resonant: a dull thud.
4. Intellectually weak or obtuse; stupid.
5. Lacking responsiveness or alertness; insensitive: half-asleep and dull to the noises in the next room.
6. Dispirited; depressed: a dull mood.
tr. & intr.v. dulled, dull·ing, dulls
To make or become dull.

[Middle English dul; akin to Old English dol.]

dull′ish adj.
dull′ness, dul′ness n.
dul′ly adv.
Synonyms: dull, colorless, drab1, humdrum, lackluster, pedestrian, stodgy, uninspired
These adjectives mean lacking in liveliness, charm, or surprise: a dull, uninteresting performance; a colorless and unimaginative person; a drab and boring job; a humdrum conversation; a lackluster life; a pedestrian movie plot; a stodgy dinner party; an uninspired lecture.
Antonym: lively
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References in classic literature ?
The general colour of the rock was dullish purple, and the stratification very distinct.
She spoke likewise to her daughter Mary, sewing maid at Pardons, and to Mary's best new friend, the five-foot-seven imported London house-maid, who taught Mary to trim hats, and found the country dullish.
Hamilton's fellow crew members include a tense German (Daniel Bruhl of The Alienist), an instantly untrustworthy Russian (Aksel Hennie), a stalwart but dullish commander (David Oyelowo) and the wisecracking comic relief (Chris O'Dowd, who certainly helps).
It's curious to have one, and I can't deny the dullish 1984 vibe that surfaced from time to time.
The brave and buoyant American media accompanying Kerry tried to paint this dullish lecture tour as a remarkable attempt to regain influence in the region.
Not exactly Dickens or even Jackie Collins, but a worthy, if dullish, stab at a subject of legitimate concern to the Black Country business sector.
WHILE striving for profundity, this would-be weepy turns into a dullish hour and a half of superficial noodling.
a dullish Viola Sonata in the Russian manner by Bunin.
This is a major factor behind aging and also causes a dullish appearance to the skin.
Judge Posner once described the "general challenge of judicial biography" as figuring out how to "write empathetically and arrestingly about dullish people who are not introspective.