What does dull mean?
Dull is a common English adjective with several related meanings, all centred on a lack of some desirable quality. Most frequently, it describes something boring, tedious, or uninteresting — a dull book, lecture, or evening fails to engage or excite. It also means physically not sharp, as with a dull knife or blade; muted or lacking brightness, as in dull colours, dull light, or a dull thud; gloomy or overcast when applied to weather; and sluggish when applied to business or trade. As a verb, dull means to become or make less sharp, bright, or keen — pain may dull, and repeated criticism can dull enthusiasm. The word derives from Old English "dol," which meant foolish rather than boring, giving modern English the related word "dullard." Its derivatives include "dully," "dullness," and "dulled." Versatile and neutral in tone, dull appears constantly in everyday speech and writing across all varieties of English.
Boring, tedious, or lacking interest or excitement.
"It was a dull afternoon with nothing worth watching on television."
Not sharp; blunt (of an edge, blade, or point).
"The kitchen knife had gone dull after years without sharpening."
In this sense the comparative and superlative forms are duller and dullest.
Muted or lacking brightness or intensity, as of light, colour, or sound.
"A dull grey sky hung over the city all morning."
To make or become less sharp, bright, intense, or keen.
"Time gradually dulled the memory of her disappointment."
Used transitively and intransitively; past tense and participle are "dulled."
"Dull" originally meant "foolish" in Old English — so calling a lecture dull once implied its speaker was dim-witted, not just that it was sleepy.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of dull
Dull descends from Old English "dol," meaning foolish or stupid, which traces back through Proto-Germanic roots; its closest surviving cognate is German "toll." The sense shifted over the Middle English period from mental slowness to general slowness, bluntness, and lack of liveliness, producing the modern range of meanings by roughly the sixteenth century. The derived word "dullard" preserves the original "foolish" sense most directly.
Related word forms
How dull is actually used
Neutral to mildly negative in register — suitable for both formal and informal contexts. In medical usage, "dull" specifically describes low-intensity, non-sharp pain. When describing people as dull, the word can sound dismissive.
Easily confused with dull
A doll is a small model of a human figure used as a toy, whereas dull means boring or lacking sharpness — the words differ in vowel sound (/ɒ/ vs /ʌ/) despite similar spelling.