adjective
Not bright or colorful.
(colloquial) Not smart or intelligent.
Indistinct, hazy or unclear.
Disapproving, unfavorable: rarely used outside the phrase take a dim view of.
noun
(archaic) Dimness.
verb
(transitive) To make something less bright.
(intransitive) To become darker.
To render dim, obscure, or dark; to make less bright or distinct.
To deprive of distinct vision; to hinder from seeing clearly, either by dazzling or clouding the eyes; to darken the senses or understanding of.
(figurative) To diminish, dull, or curtail.
adjective
(music) Clipping of diminished.