Vocabulary in Context: Subtlety

In the passage below, the author reflects on the process of writing and the emotions tied to it:

Writing is not merely the act of forming words on a page; it is a delicate balancing act between expression and inhibition, where each choice of word can evoke a myriad of feelings within the reader. A writer must be observant, attentive to the nuances of language, for the subtlety of expression can oftentimes stir deeper connections than bold declarations. It is the faint whispers of emotion hidden between the lines that often resonate the most deeply.

Which of the following words most closely matches the meaning of subtlety as used in the passage?