77 entries under strenuous topic. ×
| arduous(adjective, dull, hard, great, tough) | |
| tough(adjective, dull, hard, great, easy) | |
| laborious(adjective, dull, hard, great, tough) | |
| burdensome(adjective, dull, hard, tough, severe) | |
| tricky(noun, adjective, hard, delicate, unpleasant) | |
| knotty(adjective, hard, rough, delicate, complex) | |
| intricate(adjective, hard, delicate, complex, awkward) | |
| troublesome(adjective, hard, tough, severe, evil) | |
| trying(adjective, dull, hard, tough, severe) | |
| toilsome(adjective, hard, great, tough, difficulty) | |
| thorny(adjective, hard, rough, delicate, complex) | |
| taxing(adjective, hard, tough, rough, harsh) | |
| oppressive(adjective, dull, hard, tough, severe) | |
| demanding(adjective, dull, hard, tough, severe) | |
| backbreaking(adjective, hard, heavy, complex, awkward) | |
| onerous(adjective, dull, hard, great, tough) | |
| heavy(adjective, dull, hard, tough, severe) | |
| exhausting(adjective, dull, hard, tough, awkward) | |
| perplexing(adjective, hard, fancy, obscure, delicate) | |
| puzzling(adjective, hard, fancy, obscure, strange) |
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| APA | Smart Define. (2016). difficult thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/difficult/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "difficult thesaurus" https://smartdefine.org/difficult/thesaurus/synonyms (accessed September 21, 2026). |
| Harvard | Smart Define 2016, difficult thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/difficult/thesaurus/synonyms>. |
| MLA | Smart Define. "difficult thesaurus" 24 March 2016. Web. 21 September 2026. <https://smartdefine.org/difficult/thesaurus/synonyms> |