monotone

nouns

an unchanging intonation

drone, droning, monotone

is derived from

a single tone repeated with different words or different rhythms (especially in rendering liturgical texts)

monotone

is derived from

is a type of (narrower)

a notation representing the pitch and duration of a musical sound

"the singer held the note too long"

of a sequence or function; consistently increasing and never decreasing or consistently decreasing and never increasing in value

monotone, monotonic

sounded or spoken in a tone unvarying in pitch

"the owl's faint monotonous hooting"

flat, monotone, monotonic, monotonous