As a language expert with a deep understanding of the nuances of the English language, I can analyze the part of speech for any given word.
In the case of the word "placidly," it is an adverb. Adverbs are words that modify or describe verbs, adjectives, or other adverbs. "Placidly" is derived from the adjective "placid," which means calm or tranquil. When used as "placidly," it describes the manner in which an action is performed, typically indicating a sense of calmness or peacefulness.
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