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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
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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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.
When Cherrie was older than five, younger than thirteen, her life was dullish routine: School.
Laurie Steelsmith, medical director of Steelsmith Natural Health Center in Honolulu and an expert in hormonal balance, said that during the average 28-day cycle, a woman's skin undergoes changes such as being dry and dullish during her periods to breakouts associated with the luteal phase, which commences after ovulation.
Volumes were dullish, with only 109 million shares traded throughout the day, as compared to 223 million on the last trading day.
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.
no young fellows' teasing gag-- only to surface in the dullish
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.
"The Black Country Chamber of Commerce went through its biggest constitutional change in 2014 by replacing the four local boards representing Dudley, Sandwell, Walsall and Wolverhampton with a consultative forum that will direct focus onto members' areas of concern." (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.) From then on, it's all downhill.
WHILE striving for profundity, this would-be weepy turns into a dullish hour and a half of superficial noodling.