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

The property of being monotonous.

monotone.

simple past tense and past participle of monotone

present participle of monotone

The quality of being monotonal.

(transitive) To make monotonic. / (transitive) To make monotonous.

present participle of monotonize

Third-person singular simple present indicative form of monotonize

simple past tense and past participle of monotonize