DULL, a. [G.]1. Stupid; doltish; blockish; slow of understanding; as a lad of dull genius.2. Heavy; sluggish; without life or spirit; as a surfeit leaves a man very dull.3. Slow of motion; sluggish; as a dull stream.4. Slow of hearing or seeing; as dull of hearing; dull of seeing.5. Slow to learn or comprehend; unready; awkward; as a dull scholar.6. Sleepy; drowsy.7. Sad; melancholy.8. Gross; cloggy; insensible; as the dull earth.9. Not pleasing or delightful; not exhilarating; cheerless; as, to make dictionaries is dull work.10. Not bright or clear; clouded; tarnished; as, the mirror is dull.11. Not bright; not briskly burning; as a dull fire.12 Dim; obscure; not vivid; as a dull light.13. Blunt; obtuse; having a thick edge; as a dull knife or ax.14. Cloudy; overcast; not clear; not enlivening; as dull weather.15. With seamen, being without wind; as, a ship has a dull time.16. Not lively or animated; as a dull eye.
DULL, v.t.1. To make dull; to stupify; as, to dull the senses.2. To blunt; as, to dull a sword or an ax.3. To make sad or melancholy.4. To hebetate; to make insensible or slow to perceive; as, to dull the ears; to dull the wits.5. To damp; to render lifeless; as, to dull the attention.6. To make heavy or slow of motion; as, to dull industry.7. To sully; to tarnish or cloud; as, the breath dulls a mirror.
DULL, v.i. To become dull or blunt; to become stupid.