Duller

dull  (dl)

adj. dull·er, dull·est

1. Intellectually weak or obtuse; stupid.

2. Lacking responsiveness or alertness; insensitive.

3. Dispirited; depressed.

4. Not brisk or rapid; sluggish: Business is dull.

5. Not having a sharp edge or point; blunt: a dull knife.

6. Not intensely or keenly felt: a dull ache.

7. Arousing no interest or curiosity; boring: a dull play.

8. Not bright or vivid. Used of a color: a dull brown.

9. Cloudy or overcast: a dull sky.

10. Not clear or resonant: a dull thud.

tr. & intr.v. dulled, dull·ing, dulls

To make or become dull.

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

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dullish adj.

dullness, dulness n.

dully 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