Monotonous is an adjective.
with
The stem of the word monotonous is monotony.
The singer had an monotonous voice, the song was boring
Sally work and a cook show and became monotonous and she had fun cooking
Her voice was very monotonous, and I soon became bored listening to her talk.
Anything longer than the first round just becomes monotonous.
Answering all these simple questions is getting a bit monotonous
The noun form of the adjective 'monotonous' is monotonousness.A related noun form is monotony.
One possible adverb for "monotonous" is "monotonously," which describes an action done in a monotonous manner.
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