Synonyms of strenuous

1 Syllable

mean, hard, tough, ter, trying

2 Syllables

grueling, hellbent, upstream, taxing, uphill, hard-won, toilful, arduous, wicked, lusty, dragger, lustier

3 Syllables

go-getting, knockabout, laborious, sanguineous, slaughterous, demanding, tireless, murderous, red-blooded, hard-working, fussbudget, effortful, toilsome, kinetic, take-charge, take-over, hard-driving, weariless, painstaking, gogetting, difficult, ballbuster, exhausting, vigorous, onerous, unwearied, unwearying, sobering, herculean, dynamic, heightened, labored, takeover

4 Syllables

wearisome, operose, difficile, combative, boresome, tiresome, unamusing, overtaxing, energetic

5 Syllables

enervative

6 Syllables

indefatigable, energy-consuming