The term "monotonous" refers to something that is dull, repetitive, and lacking in variety. It often describes activities, sounds, or experiences that do not change and can become tiresome over time. For example, a monotonous job might involve performing the same tasks every day without any variation, leading to boredom. In music, a monotonous tune may consist of the same note or rhythm repeated over and over, which can make it less engaging for listeners. Overall, anything described as monotonous tends to evoke feelings of tedium and a desire for change or excitement.