strenuous
adjective
[ ˈstrɛnjʊəs ]
• requiring or using great effort or exertion.
• "the government made strenuous efforts to upgrade the quality of the teaching profession"
Similar:
arduous,
difficult,
hard,
tough,
taxing,
demanding,
exacting,
uphill,
stiff,
formidable,
heavy,
exhausting,
tiring,
fatiguing,
gruelling,
back-breaking,
murderous,
punishing,
no picnic,
killing,
knackering,
toilsome,
vigorous,
energetic,
active,
enthusiastic,
keen,
zealous,
forceful,
strong,
Herculean,
spirited,
dynamic,
intense,
determined,
resolute,
tenacious,
tireless,
stout,
indefatigable,
unremitting,
dogged,
pertinacious,
Origin:
early 17th century: from Latin strenuus ‘brisk’ + -ous.
