monotone
- (a) of a sequence or function; consistently increasing and never decreasing or consistently decreasing and never increasing in value monotonic,
-
(s) sounded or spoken in a tone unvarying in pitch
- the owl's faint monotonous hooting
Nouns
- (n) an unchanging intonation droning, drone,
- (n) a single tone repeated with different words or different rhythms (especially in rendering liturgical texts)