Vocabulary in the Cask of Amontillado . Impunity. Originates from the word punish Means Freedom from punishment Montresor desires to punish with impunity. Definitively . Comes from root word definite Here –ly ending makes the word change from an adjective to an adverb
An abstract noun meaning punishment for offenses.
In this case, Montresor does not want any retribution for his vengeful act.