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If you mean part of speech, it is an adverb. Example: She spoke pensively. Pensively modifies the verb "spoke," and is therefore an adverb.
Pensively means thoughtfully. He sat pensively as she spoke, listening hard.
The man sat the table pensively gazing at his notes.
"Jodi sat pensively, reflecting on her father's funeral."
June thought deeply and seriously about Mark's words, and continued reflecting pensively throughout the afternoon.