知性|ちせいchisei[1]atamadaka (head-high)

1. nounintelligence
   読書どくしょは知性ちせいを発展はってんさせることができる。↗

   Reading can develop your mind.

• Synonym知力ちりょくNeutralMental capacity itself, as in 「知力が衰える」. 「知性」 covers not only the power to think rationally but also the cultured, intelligent air a person gives.
• Synonym知能ちのうNeutralIntelligence as measured or engineered: 「知能指数」(IQ), 「人工知能」(AI). Common in testing and technical contexts.
• Synonym頭脳ずのうNeutralThe brain, literally or figuratively: 「頭脳明晰」, 「頭脳労働」; can also mean a key figure, the brains of a group.
• SynonymインテリジェンスNeutralLoanword for intelligence or, more often, information gathering, as in 「インテリジェンス機関」.
• Synonym理知りちWrittenCool, level-headed reason, as in 「理知的な顔立ち」. Written/formal flavour.
• Synonym才知さいちWrittenCleverness and quick wits, as in 「才知に長ける」. Literary word.
• Synonym知ちWrittenAbstract knowledge and wisdom, as in 「知の巨人」; mostly in academic commentary.
• Related知恵ちえNeutralPractical wisdom and ideas, as in 「知恵を絞る」 or 「生活の知恵」. The everyday, most common word in speech.
• Related英知えいちWrittenDeep, lofty wisdom, as in 「人類の英知」. Elevated, written register.
• Related機知きちWrittenWit shown in quick, clever replies, as in 「機知に富む会話」. Written word.
• Related理性りせいNeutralReason that holds feeling in check, as in 「理性を失う」; judging by logic rather than emotion.
• Related才気さいきWrittenBrilliance that shows, as in 「才気あふれる」. Literary.
• RelatedウイットNeutralLoanword for humour-laced wit, as in 「ウイットに富む」; clever, funny remarks.
• Related才さいNeutralTalent, usually as a suffix: 「文才」, 「才に恵まれる」. Somewhat written.
• RelatedエスプリWrittenFrench loanword for wit and sparkle, as in 「エスプリの効いた文章」; also spirit.
• Related悟性ごせいWrittenPhilosophy term for the faculty of intuitively grasping things; sometimes just means 「知性」. Rare.
• Related才力さいりょくWrittenTalent and its power, as in 「才力を尽くす」. Rare written word; say 「才能」 instead.
• Related理解力りかいりょくNeutralComprehension — how fast and how well you grasp things, as in 「理解力が高い」.
• RelatedとんちNeutralQuick on-the-spot cleverness that neatly solves a puzzle, as in 「一休さんの頓知」. 「知性」 is the underlying ability to understand and judge.
• Related巧知こうちWrittenSkilful cleverness; rare written word — say 「知恵」 instead.
• Related学習能力がくしゅうのうりょくNeutralAbility to learn new things, as in 「学習能力が高い」; common in education and AI talk.
• Antonym無知むちNeutralAntonym: lacking knowledge or awareness, as in 「無知をさらす」.
• Antonym愚鈍ぐどんWrittenAntonym: slow-witted and dull, as in 「愚鈍な男」. Written word.

Use 「知性」 for the ability to understand and judge things rationally, or a cultured, intelligent air, as in 「知性あふれる人」. For measured or technical intelligence say 「知能」; for practical wisdom and everyday ideas, 「知恵」; for quick on-the-spot wit, 「機知」. 「知力」 is mental capacity itself, 「理性」 reason over emotion, 「頭脳」 the brain or a key figure. The opposite is 「無知」.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 物事ものごとの理屈りくつを理解りかいし判断はんだんする能力のうりょく。