toneless

/ˈtoʊnləs/
adjective
  1. Without any expression, emotion, or variation in the voice; flat or dull.
    • The actor's toneless reading of the lines bored the audience.
    • He spoke in a toneless voice, as if he didn't care at all.
    • Her toneless reply made me think she was upset.
  2. Lacking musical tone or sound quality; not resonant.
    • The bell gave a toneless thud instead of a clear ring.
    • His singing was toneless and off-key.
    • The old piano produced a toneless, clanking sound.
What does "toneless" mean? | whatsthatwordmean | whatsthatwordmean