Answer:
Monotonous - Lacking in variety and interest.
Explanation:
Sentence- He walked up to me, With a very <em>Monotonous</em> look on his face.
I walked to gym with a very<em> </em><em>Monotonous</em> attitude.
I'm so sorry if these aren't good :(
C.novel is your answer
internal citation would be the correct answer