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Definition of monotone : 1. A single unvaried tone or sound.
2. The utterance of successive syllables, words, or sentences, on one unvaried key or line of pitch.

Synonyms:

mat, sameness, drone pipe, savourless, flat, decreasing monotonic, plane, prostrate, increasing monotonic, radio-controlled aircraft, excite, flavorless, droning, monotonousness, monotony, insipid, unmusical, categorical, drone, categoric, matt, matte, change, unmelodic, unconditional, pilotless aircraft, savorless, trailer, two-dimensional, dawdler, bland, monotonous, humdrum, matted, flavourless, bourdon, vapid, laggard, monotonic, unmelodious, lagger, poke, level, compressed

Usage examples:

• Yuki Chan, talking all the time in a low monotone, tried to unravel a tangle in her mind of birds and cats and dolls. - "Little Sister Snow", Frances Little.
• " Hear the will of Skull and Crossbones," chanted Crossbones in a shrill monotone. - "Prudence of the Parsonage", Ethel Hueston.
• Lord Beauregard scarcely shot at all, unless he was fairly challenged by a bird flying right past him: he seemed quite content to see his friends having plenty of work; while, in the interest of the beaters, he kept calling out, in a high monotone, Shoot high! - "Macleod of Dare", William Black.