constant; unremitting:
assiduous reading.
constant in application or effort; working diligently at a task; persevering; industrious; attentive:
an assiduous student.
Historical Examples

By his assiduousness the work was recommenced this same year, and on the 5th of August, 1858, was completed.
Hidden Treasures Harry A. Lewis

From the latter assiduousness is reached and, finally, Great Services.
Historia Amoris: A History of Love, Ancient and Modern Edgar Saltus

hard-working; persevering: an assiduous researcher
undertaken with perseverance and care: assiduous editing

1530s, from Latin assiduus “attending; continually present, incessant; busy; constant,” from assidere “to sit down to,” thus “constantly occupied” at one’s work; from ad “to” (see ad-) + sedere “to sit” (see sedentary). The word acquired a taint of “servility” in 18c. Related: Assiduously; assiduousness.

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