Usage Note
Monotone describes a sound, voice, or activity that is tediously uniform and lacks variation. It is invariable in gender (une voix monotone / un rythme monotone). The noun monotonie ('monotony') is the related abstract. Learners will recognise the direct parallel with English 'monotonous', though the French adjective ends in -tone, not -tonous.
Examples
"Sa voix monotone endormait tout le monde."
Natural Translation
His monotonous voice was putting everyone to sleep.
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