diligent worker; hard worker
Describes a person who is habitually industrious and hardworking. Often used in a positive sense.
He is a hard worker and works late every day.
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).