品性|ひんせいhinsei[1]atamadaka (head-high)

1. nouncharacter; personality

• Synonym人柄ひとがらNeutralEveryday word for what someone is like as a person, their character as others see it: 「人柄がいい」「人柄が悪い」; very common in daily speech.
• Synonym人格じんかくNeutralPersonhood—one's individuality as an independent person; also used in moral evaluation, as 「人格を疑う」「立派な人格」.
• SynonymきっぷCasualColloquial word for a hearty, open-hearted spirit, as 「気っ風がいい」; carries an old-Edo flavor.
• Related性格せいかくNeutralGeneral word for personality or disposition—one's tendencies in feeling and will; 「性格がいい」 is natural. It speaks of temperament, where 「品性」 speaks of moral character.
• Related性質せいしつNeutralNature or disposition, but also the qualities of things; far broader in use than 「品性」 and not limited to people.
• Related気質きしつNeutralInborn temperament or temper; stresses psychological traits and tendencies rather than moral character.
• Related根性こんじょうNeutralGrit and determination; also one's basic nature, and in that sense often derogatory, as 「根性が悪い」.
• Related性根しょうねNeutralOne's fundamental heart and way of thinking, as 「性根を入れ替える」; stresses the inner essence of a person.
• Related性せいWrittenWritten word for one's inborn nature, felt almost as destiny, as 「悲しい性」; tinged with resignation.
• Related人となりひととなりNeutralWhat someone has come to be—their character and nature as a whole, as 「彼の人となり」; takes in the whole person.
• Related気立てきだてNeutralDisposition or temper, especially kindness of heart: 「気立てがいい」 usually means warm and good-natured.
• Related禀性ひんせいWrittenFormal written word for the nature or temperament one is born with; rare in everyday use.
• Related性情せいじょうWrittenWritten word for nature and feeling together—one's disposition and emotions; formal prose.

Use 「品性」 for moral character or decency, as in 「品性下劣」「品性を疑う」. For personality in general say 「性格」, for what someone is like 「人柄」, for personhood 「人格」, for temperament 「気立て」. 「性質」 covers things as well as people, 「気質」 is inborn temperament, 「根性」 grit or a bad nature, 「性根」 the heart's core, 「性（さが）」 a fated nature, 「人となり」 one's whole makeup; 「気っ風」 is colloquial, 「性情」「禀性」 written.

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

1. 人柄ひとがら。人品じんぴん。品格ひんかく。