Unstimulating is a related term of monotonous.
As adjectives the difference between unstimulating and monotonous
is that unstimulating is that does not stimulate while monotonous is having an unvarying tone or pitch.
monotonous
English
Adjective
(
en adjective)
having an unvarying tone or pitch
tedious, repetitious or lacking in variety
Related terms
* monotone
* monotony
Synonyms
* monotonic
* samely