arduous
/ˈɑːdjuːəs/
/ˈɑːɹd͡ʒuəs/
adjective
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Needing or using up much energy; testing powers of endurance.
"The movement towards a peaceful settlement has been a long and arduous political struggle."
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Burning; ardent
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Difficult or exhausting to traverse.
Synonyms:
burdensome, demanding, exhausting, fatiguing, laborious, onerous, strenuous, strugglesome, wearisome