mon·o·tone / ˈmänəˌtōn/ • n. [usu. in sing.] a continuing sound, esp. of someone's voice, that is unchanging in pitch and without intonation: he sat and answered the questions in a monotone.• adj. (of a voice or other sound) unchanging in pitch; without intonation or expressiveness: his monotone reading of the two-hour report. ∎ fig. without vividness or variety; dull: the monotone housing developments of the big cities. ∎  of a single color: this monotone effect is responsible for making the room seem larger than it is.

monotone (Gr.). Recitation of liturgical text on unaltered pitch as in prayers, psalms, etc.