What part of speech is "walked" in the sentence: "She walked unhappily"?

In the sentence "She walked unhappily," "walked" functions as a verb. Verbs are action words that describe what a subject is doing, and in this case, it indicates the action that "She" is performing. The word "walked" specifically refers to the act of moving on foot, which is a clear indication of an action. Adverbs, like "unhappily" in this sentence, modify verbs by providing additional details about how the action is performed. Nouns represent people, places, things, or ideas, while adjectives describe or modify nouns, neither of which apply to "walked." Thus, recognizing "walked" as the verb in this context identifies its role as part of speech correctly.