Final answer:
Miss Y is the young, unmarried, quiet, and aloof character in The Stronger.
Step-by-step explanation:
The character in The Stronger who is young, unmarried, quiet, and aloof is Miss Y. She is described as being reserved and distant in the play. In contrast, the other characters like Mrs. X and Eskil have more prominent roles and characteristics in the story.
Learn more about Character analysis in The Stronger