What book or story is it?
Answer: stilted
Explanation: Tbh I searched the definition of “stilted”on the internet; it means “(of a manner of talking or writing) stiff and self-conscious or unnatural.” It wouldn’t be slang because slang means everyday talk. Vague means not thoroughly described. Cliché is used to describe a word, phrase, or event that is overused (ex. happily ever after, love at first sight)
The setting is a small town, where everyone knows each other, if it wasn't a small town, boo Radley might not have been known as well, and people might not have been as suspicious
The second one is your answer