- Definitions|2
- Thesaurus|647
- Abbreviations|0
| keep(noun, hold, defense, refuge, stronghold) | |
| quickness(noun, haste) | |
| stability(noun, support, control, change, strength) | |
| blockhouse(noun, defense) | |
| celerity | |
| defense(noun, cover, guard, resistance, protection) | |
| firmness(noun, support, control, change, strength) | |
| haste(noun, haste) | |
| redoubt(noun, cover, position, top, guard) | |
| speediness(noun, haste) | |
| steadiness(noun, support, control, change, strength) | |
| strength(noun, support, control, change, continue) | |
| substantiality(noun, support, control, strength, balance) | |
| acropolis(noun, hold, keep, refuge, fortification) | |
| balance(noun, support, control, strength, firmness) | |
| beachhead | |
| cohesion(noun, support, control, strength, balance) | |
| donjon(noun, hold, keep, defense, stronghold) | |
| flurry(noun, haste) | |
| fortification(noun, hold, cover, keep, position) |
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| APA | Smart Define. (2015). fastness thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/fastness/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "fastness thesaurus" https://smartdefine.org/fastness/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, fastness thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/fastness/thesaurus/synonyms>. |
| MLA | Smart Define. "fastness thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/fastness/thesaurus/synonyms> |