10 letters · 12 points in Scrabble
adjective tediously repetitious or lacking in variety
adjective sounded or spoken in a tone unvarying in pitch
originEtymology tree English monotone Proto-Indo-European *h₃ed- Proto-Indo-European *-os Proto-Indo-European *h₃édosder.? Proto-Italic *-ōtsos or *-otsos Latin -ōsus Old French -usbor. Middle English -ous English -ous English monotonous From monotone + -ous.
Etymology from Wiktionary, CC BY-SA 3.0