monotone

/ˈmɑnətoʊn/
adjective
  1. Having a single, unchanging tone or pitch; dull and repetitive.
    • His monotone voice made the lecture feel endless.
    • The monotone hum of the air conditioner was oddly relaxing.
    • She gave a monotone reading of the poem, without any expression.
noun
  1. A sound or way of speaking that does not change in pitch or tone, often sounding dull or boring.
    • The teacher's voice was a flat monotone, making it hard to stay awake.
    • The robot's speech was a perfect monotone, with no emotion at all.
    • He spoke in a monotone throughout the entire presentation.
  2. A piece of music or a passage that is sung or played on a single note without variation.
    • The composer used a monotone to create a hypnotic effect.
    • Ancient monks often sang psalms in a monotone.
    • The chant was a simple monotone repeated by the choir.
Synonyms
What does "monotone" mean? | whatsthatwordmean | whatsthatwordmean