is also spelled . This breaks down to honorific prefix _o-_ \+ _share_ , the stem of the verb _shareru_ , "to dress up, to get fancy, to be stylish, to be refined", or even "to be witty" in terms of how one speaks. This could be used as a noun, or indeed as a _-na_ adjective, like in your sample text.
You may have heard the term _dajare_ for "stupid joke": this comes from prefix _da-_ for "stupid, worthless" + this same _share_ for "witticism".
So in the context of your quote, "dressed up" certainly doesn't fit, and as you note, "stylish" also sounds funny. But "refined" or "fancy" would seem to work.