Dull, insensitive, stupid, obtuse: said, it appears, originally of the sight, whence of the perceptions generally, and the intellect. (Now…

Figurative uses. Dull, obtuse; unperceptive, unenlightened. Obsolete.

Wanting sensibility or keenness of perception in the bodily senses and feelings; insensible, obtuse, senseless, inanimate. In dialect use, esp.…

Made dull (in various senses: see dull, v. 1–5).

Of or in reference to hearing: Dull of perception; not quick or acute. Also of sight. (See also thick-eyed adj. at compounds 2b in compounds 2b, thi…

Of the act of perception or mental impression, or a faculty by which something is perceived.

= dulled, adj.

(un-, prefix1 affix 2.)

Blunted, deadened; dulled; (later, Medicine) exhibiting obtundation.

Chiefly U.S. Of a person, feeling, manner, etc.: vague, dulled, confused; bleary, groggy. Cf. muzzy, adj. 1a.