monotone

1. (of speech or a sound) Having a single unvaried pitch.Examples: "The prominence of the syllables is more monotone than in English, the intonation of the latter having a larger variation of stressed and unstressed syllables."; "In the formal register, such variation is reduced and the talk has a more monotone, business-like quality."

2. (mathematics) Of a function: that is always nonincreasing or nondecreasing on an interval.Examples: "The function f(x)#58;#61;x³ is monotone on #92;R, while g(x)#58;#61;x² is not."Synonyms: monotonic

3. (printing) Synonym of monochrome.Synonyms: monochrome