79 entries under complex topic. ×

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enigmatical(hard, delicate, tricky, complicated)
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fancy(adjective, difficult, intricate)
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full of twists and turns(expression, adjective, idiom, difficult)
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gasser(adjective, difficult, intricate)
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hard to explain(expression, hard, delicate, tricky)
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hard to solve(expression, hard, delicate, tricky)
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hi-tech(adjective, difficult, intricate)
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inexplicable(hard, delicate, tricky, complicated)
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interlaced(adjective, difficult, intricate)
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loose(hard, delicate, tricky, complicated)
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mega factor(expression, adjective, difficult, intricate)
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mixed(adjective, difficult, involved, dense)
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mystical(hard, delicate, tricky, complicated)
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subtle(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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various(adjective, difficult, intricate)
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vexing(hard, delicate, tricky, complicated)
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wheels within wheels(expression, adjective, idiom, difficult)
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APASmart Define. (2015). thorny thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/thorny/thesaurus/synonyms
ChicagoSmart Define. 2015. "thorny thesaurus" https://smartdefine.org/thorny/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, thorny thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/thorny/thesaurus/synonyms>.
MLASmart Define. "thorny thesaurus" 13 April 2015. Web. 25 September 2026. <https://smartdefine.org/thorny/thesaurus/synonyms>