The best definition of the underlined prefix from the word, "unforgivable" is b. not.
What does the prefix, "un" mean?
When something begins with the prefix, "un," it generally means that the following term is not possible.
For instance, unforgivable means that the act cannot be forgiven and undone means that the action was not done.
Find out more on prefixes at https://brainly.com/question/21514027.
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