na-adjective
intellectual; rational; cerebral
Describes a person, attitude, or approach that is logical, reason-based, and unemotional. Often used positively for clear thinking, but can imply a lack of warmth.
彼の理知的な説明にみんな納得した。
Everyone was convinced by his rational explanation.
彼女はとても理知的な人で、感情に流
She is a very intellectual person and doesn't get carried away by emotions.
知的 means 'intellectual' in a broader sense, often related to intelligence or knowledge. 理知的 emphasizes rationality and logical reasoning, sometimes with a nuance of being unemotional.
理性的 also means 'rational', but focuses more on being guided by reason rather than emotion. 理知的 can describe a person's inherent nature or style, while 理性的 often refers to a deliberate choice or state.
Compound of 理知 (richi, 'reason; intellect') + 的 (-teki, '-like; -ical'). 理知 itself is a combination of 理 (ri, 'logic; principle') and 知 (chi, 'knowledge; wisdom').