1. lacking in variety; tediously uniform or unvarying

Examples

• The monotonous hum of the air conditioner made it hard to concentrate.
• She quit her job because the work had become monotonous.
• The speaker’s monotonous voice put half the audience to sleep.
• After hours of monotonous highway driving, we were ready for a break.
• The monotonous routine of daily chores left her feeling restless.
• His monotonous delivery made even the exciting story sound boring.