monotonous
/məˈnɑtənəs/
adjective
- Boring because it does not change; always the same and therefore dull.
- She found her job monotonous because she did the same tasks every day.
- The teacher's monotonous voice made it hard for the students to stay awake.
- The long drive through the desert was monotonous, with nothing but sand for hours.
Synonyms