- Definitions|2
- Thesaurus|2.1k
- Abbreviations|0
70 entries under hard topic. ×
| deep(noun, adjective, good, feeling, strong) | |
| serious(adjective, difficult, complex, deep) | |
| esoteric(adjective, easy, obscure, difficult) | |
| difficult(adjective, complex, thoughtful, intellectual) | |
| weighty(adjective, difficult, complex, thoughtful) | |
| severe(adjective, difficult, intense, complex) | |
| knotty(adjective, difficult, complex) | |
| intricate(adjective, difficult, complex) | |
| involved(adjective, difficult, complex) | |
| tricky(adjective, difficult, complex, cunning) | |
| complex(adjective, difficult, tedious, demanding) | |
| laborious(adjective, difficult, complex) | |
| thorny(adjective, difficult, complex) | |
| arduous(adjective, difficult, complex) | |
| grave(adjective, difficult, complex, greatness) | |
| grievous(adjective, difficult, complex) | |
| sophisticated(adjective, difficult, complex, intelligent) | |
| backbreaking(adjective, difficult, complex) | |
| complicated(adjective, difficult, complex) | |
| heartrending(adjective, difficult, intense, complex) |
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| APA | Smart Define. (2016). profound thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/profound/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "profound thesaurus" https://smartdefine.org/profound/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2016, profound thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/profound/thesaurus/synonyms>. |
| MLA | Smart Define. "profound thesaurus" 26 February 2016. Web. 22 September 2026. <https://smartdefine.org/profound/thesaurus/synonyms> |