性しょうの良よい

also: しょうのいい

Meanings

1

expression, i-adjective (yoi/ii class)

Describes a person's inherent character as amiable, gentle, or easy to get along with.

良よ

く

て

、

子こ

供ども

に

も

優やさ

しい

。

That dog has a good temperament and is gentle even with children.

2

expression, i-adjective (yoi/ii class)

Used for the inherent quality of objects, materials, or products. Less common than the character sense.

気き立だての良よい
気立ての良い specifically refers to a person's disposition or temper, while 性の良い can also refer to the quality of things.
質しつの良よい
質の良い is more common for describing the quality of objects or materials, whereas 性の良い is primarily used for character.

Compound of 性 (しょう, 'nature, character, quality') + の (possessive particle) + 良い/いい ('good'). The reading しょう is the on'yomi of 性.