Monotone

[Dave Paprocki]

The utterance of successive syllables, words, or
sentences, on one unvaried key or line of pitch.

[Oralee]

A continuing sound, especially of a persons voice, that is unchanging in pitch and without intonation.

[Jason Yan]

when a person is so [fucking gay] that they cant even raise their voice. they only have one tone like emma, [elliot], and [mr johnson]. they cant use exclamation points or queston marks.