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25 entries under complex topic. ×

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inexplicable(hard, delicate, tricky, complicated)
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mysterious(hard, delicate, tricky, complicated)
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troublesome(hard, delicate, tricky, complicated)
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unclear(hard, delicate, tricky, complicated)
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unintelligible(hard, delicate, tricky, complicated)
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APASmart Define. (2011). hard to solve thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/hard_to_solve/thesaurus/synonyms
ChicagoSmart Define. 2011. "hard to solve thesaurus" https://smartdefine.org/hard_to_solve/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2011, hard to solve thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/hard_to_solve/thesaurus/synonyms>.
MLASmart Define. "hard to solve thesaurus" 21 May 2011. Web. 23 September 2026. <https://smartdefine.org/hard_to_solve/thesaurus/synonyms>