monotonic

/ˌmɑnəˈtɑnɪk/
adjective
  1. Speaking or sounding in a single, unchanging tone; dull and without variation.
    • His monotonic reading of the instructions put everyone to sleep.
    • I found her monotonic voice very hard to listen to for long.
    • The actor's monotonic delivery ruined the dramatic scene.
  2. In mathematics: describing a function or sequence that always increases or always decreases, never changing direction.
    • We need to prove that this sequence is monotonic.
    • The graph shows a monotonic increase in temperature over time.
    • A monotonic function either goes up or down but never both.
Synonyms
What does "monotonic" mean? | whatsthatwordmean | whatsthatwordmean