Meaning

verb make dull in appearance

verb become dull or lusterless in appearance; lose shine or brightness

verb deaden (a sound or noise), especially by wrapping

originFrom Middle English dull, dul (also dyll, dill, dwal), from Old English dol (“dull, foolish, erring, heretical; foolish, silly; presumptuous”), from Proto-West Germanic *dol, from Proto-Germanic *dulaz, from earlier *dwulaz, a variant of *dwalaz (“stunned, mad, foolish, misled”), from Proto-Indo-European *dʰwel-, *dʰewel- (“to dim, dull, cloud, make obscure, swirl, whirl”). Cognate with Scots…

Etymology from Wiktionary, CC BY-SA 3.0