What is another word for onerous?

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

Requiring much time, effort, or careful attention
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“But the new rules will place onerous responsibilities on employers.”
Difficult to endure
“… had the onerous and stressful job of notifying the families of soldiers killed in action.”
(of a person) Lacking sophistication or refinement
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Slow and clumsy because of great weight
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