The best word that describes the tone from the following excerpt from the Pardoner's Tale is foreboding.
In literary contexts, tone often refers to the mood that an author conveys through word choice and the feelings that the book may elicit in the reader. Any number of feelings and viewpoints can be evoked by the tone an author adopts in a piece of writing.
The word foreboding means feeling of apprehension. The above mentioned excerpt uses the word "wary" which means exhibiting or experiencing caution over potential risks or issues.
The word wary can be used to know the tone of the excerpt from Pardoner's Tale which is foreboding means the character has a feeling that something bad is gonna happen.
The missing excerpt of the question is:
If you should meet him; you had best be wary./ be on your guard with such an adversary,/ be primed to meet him everywhere you go,/ that's what my mother said. It's all I know.
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Dumbfounded means to be left utterly speechless, or to simply be amazed/confused.
ITS (A.) Cause he said "you" which is directly addressing the reader.