1. a single unvaried tone or sound
2. a way of speaking or singing without changing pitch

1. having or producing a single unvaried tone
2. lacking in variety; tediously uniform

Examples

• The professor’s monotone voice put half the class to sleep.
• She spoke in a complete monotone, showing no emotion.
• The machine produced a steady monotone hum.
• His monotone delivery made the exciting story sound boring.
• The monotone beeping of the alarm continued for hours.
• The lecture was delivered in such a monotone manner that students struggled to stay awake.
• The monotone landscape stretched endlessly across the desert.