| bombproof | |
| bony | |
| bovine(adjective, determined, resolute, obstinate, uncompromising) | |
| brass-bound(adjective, determined, resolute, obstinate, uncompromising) | |
| brawny(adjective, strong, hard, sound, tough) | |
| breachy | |
| breakaway | |
| brittle(adjective, hard, firm, solid, tense) | |
| broad | |
| buckram(adjective, hard, firm, solid, tense) | |
| bull-headed(adjective, determined, resolute, obstinate, uncompromising) | |
| bulletproof | |
| burglarproof | |
| callous(adjective, hard, unfeeling, unsympathetic, prepared) | |
| cartilaginous | |
| case-hardened(adjective, hard, unfeeling, unsympathetic, prepared) | |
| cement | |
| cemental | |
| cemented(adjective, hard, firm, solid, tense) | |
| chewy |
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| APA | Smart Define. (2015). resistant thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/resistant/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "resistant thesaurus" https://smartdefine.org/resistant/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, resistant thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/resistant/thesaurus/synonyms>. |
| MLA | Smart Define. "resistant thesaurus" 19 August 2015. Web. 22 September 2026. <https://smartdefine.org/resistant/thesaurus/synonyms> |