mon·o·tone
ˈmänəˌtōn/
noun
a continuing sound, especially of someone's voice, that is unchanging in pitch and without intonation.
adjective
(of a voice or other sound) unchanging in pitch; without intonation or expressiveness.
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Monotone || Mashton {On Hold} (boyxboy)
FanfictionA vocal utterance or series of speech sounds in one unvaried tone.