Synonyms|145Antonyms|65|Broader|0Narrower|0Related|377
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heavy
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impracticable unachievable(expression, idiom, impossibility)
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impregnable
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inaccessibly
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infrangible
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innavigable
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invincible
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inviolable
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invulnerable
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irrefutable
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irresoluble
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irresolvable
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lamer
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leakproof
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locked away(verb, expression, phrasal verb)
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lost
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misplaced
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not available(expression, idiom)
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not obtainable(expression, idiom)
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occlusions
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APASmart Define. (2015). unobtainable thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/unobtainable/thesaurus/synonyms
ChicagoSmart Define. 2015. "unobtainable thesaurus" https://smartdefine.org/unobtainable/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2015, unobtainable thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/unobtainable/thesaurus/synonyms>.
MLASmart Define. "unobtainable thesaurus" 14 April 2015. Web. 27 September 2026. <https://smartdefine.org/unobtainable/thesaurus/synonyms>