Synonyms|191Antonyms|2|Broader|0Narrower|0Related|63

17 entries under adjective topic. ×

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arduous
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backbreaking
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difficult
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effortful
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exhausting
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formidable
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gruelling
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hard
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heavy
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knotty
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labored
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laborious
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severe
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strenuous
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tough
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uphill
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wearying
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APASmart Define. (2013). endeavors thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/endeavors/thesaurus/synonyms
ChicagoSmart Define. 2013. "endeavors thesaurus" https://smartdefine.org/endeavors/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2013, endeavors thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/endeavors/thesaurus/synonyms>.
MLASmart Define. "endeavors thesaurus" 17 June 2013. Web. 20 September 2026. <https://smartdefine.org/endeavors/thesaurus/synonyms>