Noah Webster
Dullness
DULLNESS, noun
1. Stupidity; slowness of comprehension; weakness of intellect; indocility; as the dullness of a student.
2. Want of quick perception or eager desire.
3. Heaviness; drowsiness; inclination to sleep.
4. Heaviness; disinclination to motion.
5. Sluggishness; slowness.
6. Dimness; want of clearness or luster.
7. Bluntness; want of edge.
8. Want of brightness or vividness; as dullness of color.