Of good quality or performance; superior, excellent. Often used for products, services, grades, or companies.
この工場の製品は優良だと顧客から評価された。
Customers rated the factory's products as excellent.
学校は成績優良者に奨学金を与えた。
The school awarded scholarships to students with excellent grades.
優良企業として長年にわたり信頼を築いてきた。
They have built trust over many years as a reputable company.