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Đồng nghĩa
arduous
US
UK
adjective
The Sherpas were well equipped for the arduous climb. What an arduous task it is to read the proofs of a dictionary!
laborious
difficult
hard
tough
strenuous
onerous
burdensome
back-breaking
painful
Formal
operose
tiring
exhausting
wearisome
fatiguing
taxing
gruelling
trying
formidable
Montrose made arduous efforts to reconstruct his army
energetic
strenuous
vigorous
US