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arduous	entailing great difficulty, exertion, or endurance; laborious. [1/3 definitions]
lucubration	laborious study or work, esp. late at night. [1/3 definitions]
toil¹	long or laborious work or effort. [1/3 definitions]
toilsome	characterized by or requiring much effort or labor; laborious.
troublesome	difficult; burdensome; laborious. [1/2 definitions]
uphill	requiring great effort; difficult; laborious. [1/5 definitions]

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