Meaning

adjective lacking in liveliness or animation

adjective emitting or reflecting very little light

adjective being or made softer or less loud or clear

originEtymology tree English dull Proto-Indo-European *-yósder. Proto-Italic *-āzijos Latin -āriusnom. Latin -āriusbor. Proto-Germanic *-ārijaz Proto-West Germanic *-ārī Old English -ere Middle English -ere English -er English duller From dull (verb) + -er.

Etymology from Wiktionary, CC BY-SA 3.0