c. 1200, "to grow weary, tire;" of pointed or edged things from c. 1400; of the senses from 1550s; from dull (adj.). Related: Dulled; dulling.

c. 1200, "stupid;" early 13c., "blunt, not sharp;" rare before mid-14c., apparently from Old English dol "dull-witted, foolish," or an unrecorded parallel word, or from M [..]

See Dull Luster

lacking in liveliness or animation; "he was so dull at parties"; "a dull political campaign"; "a large dull impassive man" [..]

uninteresting, not lively or sharp, with no sparkle

 not quick or sharp; slow, heavy, drowsy; gloomy; blunt.

nudne

Tea liquor which is not clear or bright.

(v) make dull in appearance(v) become dull or lusterless in appearance; lose shine or brightness(v) deaden (a sound or noise), especially by wrapping(v) make numb or insensitive(v) make dull or blunt( [..]

See Dark.

Quality liquor is not bright; poor

Those minerals in which there is a total absence of luster, as chalk or kaolin.

A luster with very little or no reflectivity. They are typically porous or fine grained.

The luster of minerals with very poor optical properties.

soothing

lang=en 1600s=1678 |1800s=1818
1843 * '''1678''' — . ''''. *: And here Hopeful began to be very dull and heavy of sleep; wherefore he said unto Christian, I do now begin to grow so drowsy that [..]