- requiring great exertion; laborious; difficult: an arduous undertaking.
- requiring or using much energy and vigor; strenuous: making an arduous effort.
- hard to climb; steep: an arduous path up the hill.
- hard to endure; full of hardships; severe: an arduous winter.
- requiring great physical or mental effort; difficult to accomplish; strenuous
- hard to endure; harsh
- hard to overcome or surmount; steep or difficult
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