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Synonyms for Thinking (same or very similar meaning)

WordNet sense 1 (the process of using your mind to consider something carefully):
cerebration, thought, intellection, mentation, thought process

WordNet sense 2 (endowed with the capacity to reason):
intelligent, reasoning

WordNet sense 3 (consistent with or based on or using reason):
rational


From the ODE community, based on WordNetadd/edit