strenuous

strenuous
adj.
P. and V. ἔντονος, σύντονος, ὀξύς, πρόθῡμος, σπουδαῖος, δραστήριος, P. σφοδρός.
Strong, intense: P. ἰσχυρός.

STRENUOUS

strenuus: fortis: animosus: acer.

strenuous:

I. Energetic, active, vigorous, q. v.: ācer, strēnuus, impĭger, vĕhĕmens.

II. Brave, courageous, q. v.: fortis, ănĭmōsus.

strenuus
brisk, nimble, quick, prompt, active, vigorous, strenuous

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appearing fewer than 50 times

enixus
strenuous, earnest, zealous
obnixus
strenuous, firm, resolute