1. (adj)thinking, thought, thought process, cerebration, intellection, mentation the process of using your mind to consider something carefully Synonyms: persuasion, thinking, idea, cerebration, opinion, view, sentiment, intellection, thought process, mentation, thought Antonyms: irrational
2. (adj)intelligent, reasoning(a), thinking(a) endowed with the capacity to reason Antonyms: irrational