- Definitions|2
- Thesaurus|1.8k
- Abbreviations|0
443 entries under adjective topic. ×
| cutting | |
| discriminating(close, correct, fine, solid) | |
| drastic(severe, harsh, cruel, brutal) | |
| effortful(tough, rough, difficult, harsh) | |
| fierce(hard, tough, harsh, intense) | |
| fixed(hard, severe, stiff, rigid) | |
| formidable(hard, tough, severe, rough) | |
| hard-hearted(hard, tough, harsh, cruel) | |
| heavy(strong, hard, tough, severe) | |
| implacable(strong, hard, tough, harsh) | |
| inelastic | |
| intricate(tough, rough, difficult, heavy) | |
| mean(tough, severe, rough, difficult) | |
| murderous(hard, tough, harsh, cruel) | |
| painful(hard, tough, severe, difficult) | |
| peremptory(severity, authoritative, overbearing) | |
| pitiless(hard, tough, severe, harsh) | |
| prim(thoughtful, sober, cautious, prudent) | |
| ruthless(hard, tough, harsh, unpleasant) | |
| scientific(close, correct, solid, exact) |
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| APA | Smart Define. (2016). rigorous thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/rigorous/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "rigorous thesaurus" https://smartdefine.org/rigorous/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2016, rigorous thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/rigorous/thesaurus/synonyms>. |
| MLA | Smart Define. "rigorous thesaurus" 26 February 2016. Web. 24 September 2026. <https://smartdefine.org/rigorous/thesaurus/synonyms> |