Prefixxes and sufixxes are both___.

"He is an ignoramus," interrupted my friend, as he stepped unsteadily forward."

Explanation:

A situational irony is a form of irony where the expected event is completely opposite of the outcome. And in Edgar Allen Poe's "The Cask of Amontillado," there are several instances of such situational irony.

One instance of situational irony is when Fortunato calls Luchesi a fool, an idiot. "He is an ignoramus," interrupted my friend, as he stepped unsteadily forward." This is a case of situational irony in that Fortunato calls someone a fool while he himself is also walking towards his death, being fooled by Montresor. While criticizing someone, he is also doing the same thing.  And in the end, he is "walled in" by Montresor.