monotone
n. countablen. a voice that stays at the same level and does not change. It can also describe a style of speaking that is boring because it never gets excited or quiet.
n. a voice or style of speaking that lacks variation in pitch or tone. Often used to describe a delivery that is perceived as dull or unemotional.
The teacher's monotone made it hard for the students to stay awake.
The speaker's monotone delivery failed to engage the audience, leading to a noticeable drop in attendance for the second half of the lecture.
While the poet intended to evoke a sense of quiet reflection, the actor's monotone performance stripped the verses of their emotional weight and rhythmic complexity.
From the post-Classical Latin monotonus (“unvarying in tone”) or its etymon the Ancient Greek μονότονος (monótonos, “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.