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Comprehensive
Dictionary Suite
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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]