Synonyms|501Antonyms|98|Broader|3Narrower|0Related|375
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hard-bitten(adjective, hard, tough, harsh, cruel)
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hard-headed(adjective, persistent, constant, pitiless, unyielding)
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hard-hearted(adjective, hard, tough, harsh, cruel)
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hardened(adjective, hard, tough, harsh, cruel)
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hardworking
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harsh(adjective, hard, tough, cruel, grim)
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hell-bent
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hourly
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immortal(continuous, endless, unrelenting, everlasting, uninterrupted)
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immovable
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impenitent(adjective, hard, tough, harsh, cruel)
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imperishable(continuous, lasting, permanent, everlasting, uninterrupted)
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in for long haul
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in for the long haul(expression, idiom, permanent, long-term, lifelong)
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inalterable
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incommutable
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inconvertible
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indefeasible
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indelible(permanent, long-term, lifelong)
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indissoluble(permanent, long-term, lifelong)
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APASmart Define. (2015). unremitting thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/unremitting/thesaurus/synonyms
ChicagoSmart Define. 2015. "unremitting thesaurus" https://smartdefine.org/unremitting/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2015, unremitting thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/unremitting/thesaurus/synonyms>.
MLASmart Define. "unremitting thesaurus" 10 April 2015. Web. 26 September 2026. <https://smartdefine.org/unremitting/thesaurus/synonyms>