What is another word for arduous?

Need synonyms for arduous? Here's a list of similar words from our thesaurus that you can use instead.

Difficult to endure or accomplish
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“Her working hours increase, her pay is cut, and the conditions under which she must toil become increasingly arduous.”
Difficult to understand or deal with
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Impressive or grand in size, appearance, or manner
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Dangerously high or steep
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