noun
diligent worker; hard worker
Describes a person who is habitually industrious and hardworking. Often used in a positive sense.
彼は勤勉家で、毎日遅くまで働いている。
He is a hard worker and works late every day.
勤勉家の彼女は、休日も勉強を欠かさない。
Being a diligent worker, she never misses studying even on holidays.
努力家 emphasizes making great effort, often in the face of difficulty, while 勤勉家 focuses on steady, habitual diligence.
Compound of 勤勉 (diligence) and 家 (person with a certain trait).