sedulous
https://gyazo.com/6ef238783a2ea0d2e4c2500956d33d65
BUSY chiefly stresses activity as opposed to idleness or leisure. e.g. too busy to spend time with the children
INDUSTRIOUS implies characteristic or habitual devotion to work. e.g. industrious employees
DILIGENT suggests earnest application to some specific object or pursuit. e.g. very diligent in her pursuit of a degree
ASSIDUOUS stresses careful and unremitting application. e.g. assiduous practice
e.g. a sedulous investigation of the murder
adjective
｟かたく｠ 勤勉な; 念入りの
e.g. he watched himself with the most sedulous care.
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ORIGIN