strenuous

Reading level: hard

Estimated CEFR level: C1 — Advanced

Estimated from word frequency; not an official CEFR classification.

Definition

adjective characterized by or performed with much energy or force
adjective taxing to the utmost; testing powers of endurance; ; ; - F.D.Roosevelt

From Latin strenuus (“quick”).

I was strenuous against the project. — A Connecticut Yankee in King Arthur's Court, Mark Twain
He looked very earnest and strenuous. — The Forsyte Saga - Complete, John Galsworthy
With Clotilde I was even more strenuous. — The rose of old St. Louis, Mary (Mary C. Johnson) Dillon

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