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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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