| fire-retardant | |
| fit(adjective, strong, hard, solid, stiff) | |
| fleecy | |
| flinty(adjective, strong, hard, solid, stiff) | |
| gangling(tough, narrow, slim, sinewy) | |
| gluey | |
| gummy | |
| hard-bitten(adjective, strong, hard, solid, stiff) | |
| hard as nails(expression, adjective, idiom, strong, hard) | |
| herculean(vigorous, sturdy, robust, brawny, well-built) | |
| hulky(vigorous, sturdy, robust, brawny, well-built) | |
| husky(vigorous, sturdy, robust, brawny, well-built) | |
| indigestible(adjective, strong, hard, solid, stiff) | |
| inflexible | |
| lacy | |
| lank(tough, narrow, slim, sinewy) | |
| lanky(tough, narrow, slim, sinewy) | |
| light(thin, delicate, flimsy, sinewy) | |
| limber(thin, sinewy) | |
| long(tough, narrow, slim, sinewy) |
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| APA | Smart Define. (2015). fibrous thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/fibrous/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "fibrous thesaurus" https://smartdefine.org/fibrous/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2015, fibrous thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/fibrous/thesaurus/synonyms>. |
| MLA | Smart Define. "fibrous thesaurus" 13 April 2015. Web. 23 September 2026. <https://smartdefine.org/fibrous/thesaurus/synonyms> |