Other forms: monotones
A monotone is a voice that stays on one flat note, with no rise or fall. Every sentence ends where it started.
It is what makes a talk hard to follow, since English uses pitch to signal questions, emphasis and the end of an idea, and removing it removes the signposts. Speaking in a monotone is the fixed phrase. The word also works as an adjective. Its relative monotonous means tediously unvarying, which is what a monotone delivery produces in an audience.
1nounmonotoneA way of speaking without variation in pitch.
“He read the whole notice in a flat monotone.”
Monotone is one tone and no other. Greek monotonos meant steady or unwavering and Latin monotonus unvarying in tone; the boredom is English.
Latin
monotonus — unvarying in tone
English, today
monotone
Built from
From the post-Classical Latin monotonus (“unvarying in tone”) or its etymon the Ancient Greek - μονότονος (“steady”, “unwavering”); compare cognate adjectives, namely the French monotone, the German monoton, the Italian monotono, and the Spanish monótono, as well as the slightly earlier English noun monotony and adjective monotonical.
Etymology from Wiktionary, CC BY-SA