monotone
🇺🇸
/ˈmɑːnətəʊn/
🇬🇧
/ˈmɒnətəʊn/
A single, unchanging tone or way of speaking that can seem boring.
His speech was so monotone that everyone started to fall asleep.
Lacking changes or variety in sound, color, or pattern.
The landscape was monotone, with only one shade of brown visible.