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"dull" is also used as a crossword clue. If that's what you saw, the answer is often lackluster (10 letters).
Definitions
(of business) not active or brisk
Word origin
From Middle English dull, dul (also dyll, dill, dwal), from Old English dol (“dull, foolish, erring, heretical; foolish, silly; presumptuous”), from Proto-West Germanic *dol, from Proto-Germanic *dulaz, from earlier *dwulaz, a variant of *dwalaz (“stunned, mad, foolish, misled”), from Proto-Indo-European *dʰwel-, *dʰewel- (“to dim, dull, cloud, make obscure, swirl, whirl”).
Used in a sentence
“All these knives are dull.”
“He sat through the dull lecture and barely stayed awake.”
“"You are very dull this morning, Sheriff," said the youngest daughter of the house, who, being the baby and pretty, had grown pettishly privileged in speech.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer3 curated clues
01“Lacking shine”4 letters
02“Not shiny or sharp”4 letters
03“Not sharp or lively”4 letters
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