- Definitions|2
- Thesaurus|817
- Abbreviations|0
| negating(verb, confuting) | |
| obstinate(adjective, defiant) | |
| onerous(adjective, hard, great, tough, severe) | |
| probing(verb, adjective, questioning) | |
| problematical(adjective, difficult, awkward, demanding, tricky) | |
| rebelling(verb, defying) | |
| recalcitrant(adjective, defiant) | |
| refuting(verb, confuting) | |
| resistant(adjective, unwilling, opposed, defiant) | |
| rugged(adjective, difficult, awkward, demanding, grueling) | |
| spunky | |
| stimulant(adjective, offensive, stimulating, disturbing, provoking) | |
| stirring | |
| strenuous(adjective, great, tough, severe, difficult) | |
| titanic(tough, severe, painful, problematic, trying) | |
| toilsome(adjective, great, tough, severe, difficult) | |
| tough(adjective, great, severe, difficult, painful) | |
| unyielding(adjective, tough, severe, painful, problematic) | |
| abnegating(verb, confuting) | |
| abrogating(verb, confuting) |
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| APA | Smart Define. (2016). challenging thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/challenging/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "challenging thesaurus" https://smartdefine.org/challenging/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2016, challenging thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/challenging/thesaurus/synonyms>. |
| MLA | Smart Define. "challenging thesaurus" 2 March 2016. Web. 22 September 2026. <https://smartdefine.org/challenging/thesaurus/synonyms> |