Diligent in application or pursuit; constant, steady, and persevering in business, or in endeavors to effect an object; steadily industrious; assiduous;
A religion which sedulously opposes its own improvement can do nothing essential toward improving any thing else, unless forced into it by outside influences;
Kersey and Lydia Graves. The Bible of Bibles (1879)
---
They teach us in our course of philosophy to sedulously avoid the fables of the poets and the fancies of the vulgar, as the false conclusions of the sceptics.
William Harvey. On The Motion of The Heart And Blood In Animals (1628)
---
He remembered how carefully and at what length everything relating to form and procedure was discussed at those meetings, and how sedulously and promptly all that related to the gist of the business was evaded.
Leo Tolstoy. War and Peace: With bonus material from Give War and Peace A Chance by Andrew D. Kaufman