7 entries under complex topic. ×

19
difficult(adjective, hard)
19
hard(adjective, difficult)
19
intricate(adjective, hard, difficult)
19
knotty(adjective, hard, difficult)
19
perplexed(adjective, hard, difficult)
19
tough(adjective, hard, difficult)
18
complicated(adjective, hard, difficult)
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APASmart Define. (2015). hard to understand thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/hard_to_understand/thesaurus/synonyms
ChicagoSmart Define. 2015. "hard to understand thesaurus" https://smartdefine.org/hard_to_understand/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, hard to understand thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/hard_to_understand/thesaurus/synonyms>.
MLASmart Define. "hard to understand thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/hard_to_understand/thesaurus/synonyms>