adjective
a word that describes or modifies a noun or pronoun; in this case, 'not surprised' describes the state of being surprised
adverb
a word that modifies a verb, adjective, or other adverb; in this case, 'not' modifies the adjective 'surprised'
-
I am not surprised by the results of the experiment, as they align with previous research findings.
-
I'm not surprised that she canceled at the last minute, she's always flaky.
-
I'm not surprised that he bailed on us, he's been acting shady lately.
-
When he failed the test, I was not surprised - his lack of preparation was evident.