What does «monótono» mean in Spanish?

Which is almost always in the same tone.

Examples of use in Spanish: "canción monótona".
Too uniform; little or no variation.

Examples of use in Spanish: "paisaje monótono".
Boring or tiresome because it is too invariable, unchanging; lacking in variety or repetitive; tediously unchanging.

Examples of use in Spanish: "una conversación monótona".

"es un trabajo monótono y repetitivo".