| sinewy(adjective, strong, sound, tough, solid) | |
| sold(verb, supplied) | |
| solidified | |
| sound(adjective, strong, tough, solid, heavy) | |
| spread | |
| stable(adjective, strong, sound, tough, solid) | |
| stalwart(adjective, strong, sound, tough, solid) | |
| stark(adjective, strong, sound, tough, solid) | |
| staunch(adjective, strong, sound, tough, solid) | |
| steady(adjective, strong, sound, tough, solid) | |
| steeled | |
| stout(adjective, strong, sound, tough, solid) | |
| strapping(adjective, strong, sound, tough, solid) | |
| substantial(adjective, strong, sound, tough, solid) | |
| supplied(verb, supplied) | |
| sustained | |
| swollen | |
| tempered(verb, strengthened) | |
| tenacious(adjective, strong, sound, tough, solid) | |
| tightened |
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| APA | Smart Define. (2015). reinforced thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/reinforced/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "reinforced thesaurus" https://smartdefine.org/reinforced/thesaurus/synonyms (accessed September 27, 2026). |
| Harvard | Smart Define 2015, reinforced thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/reinforced/thesaurus/synonyms>. |
| MLA | Smart Define. "reinforced thesaurus" 13 April 2015. Web. 27 September 2026. <https://smartdefine.org/reinforced/thesaurus/synonyms> |