The property of being monotonous.

In a manner that is tedious, repetitious or lacking in variety. / In a droning manner, that does not change pitch.

Having an unvarying pitch or tone. / Tedious, repetitious, or lacking in variety.

of or using the Greek system of diacritics which discards the breathings and employs a single accent to indicate stress. It replaced polytonic system in 1982.

A single unvaried tone of speech or a sound. / A piece of writing in one strain throughout.

(transitive, intransitive) To speak in a monotone.

(of speech or a sound) Having a single unvaried pitch. / (mathematics) Being, or having the salient properties of, a monotone function.

plural of monotone

In a monotonic manner, pertaining to the Greek system of diacritics which discards the breathings and employs a single accent to indicate stress

In a monotonal fashion.