Consisting of mud or earth; gross; impure.

Not clear or bright.

Not clear. Weak harmonics, smeared time response, IM distortion. Too much reverb or leakage at low frequencies.

(of color) discolored by impurities; not bright and clear; "dirty" is often used in combination; "a dirty (or dingy) white"; "the muddied gray of the sea"; "muddy colors"; "dirty-green walls"; "dirty-blonde hair"

When speaking of clear materials, this describes the lack of a bright, clear, transparent appearance. A muddy color is one having a trace of brown in it, which takes away the purity or brightness of the color.