Final answer:
In The Stronger, the character who fits the description of being young, unmarried, quiet, and aloof is Miss Y.
Step-by-step explanation:
The character in The Stronger who is young, unmarried, quiet, and aloof is Miss Y. She is the quieter of the two characters in the play and tends to observe more than participate in conversations. She is also unmarried and her aloofness is depicted through her minimal interactions with the other characters.
Learn more about Character analysis in The Stronger