Monotonous- Adj–Tediously repetitious or lacking in variety or boring
The word āmonotonouslyā is found on the second paragraph of the Shawl by Louise Erdrich.
āIf she could have thrown off that wrong hearted love, she would have, but the thought of the other man, who lived across the lake, was with her always. She became a gray sky, stared monotonously at the walls, sometimes wept into her hands for hours at a time. Soon, she couldnāt rise to cook or keep the cabin neatā¦ā
The meaning of the word I understand is that the woman who lost her interest when she was in love with another man who was not her husband . She was so in love with him and the passion and the thought that she has for that man took all her interest and she was not able to function her daily routine like cooking, cleaning and taking care of her baby.