monotones
mo-no-tones
verb
(Third person singular present of 'monotone') To speak or sing in a single, unvarying pitch.
"She monotones her lines, making them boring."
noun
A series of sounds or speech delivered without variation in pitch.
"His voice was full of dull monotones."
Thesaurus
Synonyms: increasing monotonic, decreasing monotonic, monotonic, monotone, drone, droning, unmodulated, flat, monotonous
Antonyms: nonmonotonic