- Definitions|2
- Thesaurus|647
- Abbreviations|0
| permanence(noun, support, control, strength, balance) | |
| citadel(noun, structure, defense, stronghold, reinforcement) | |
| stronghold(noun, hold, cover, keep, position) | |
| fortress(noun, hold, cover, keep, position) | |
| swiftness(noun, haste) | |
| speed | |
| fort(noun, hold, cover, keep, position) | |
| base complex(significance, facility, army) | |
| bastion(noun, cover, position, top, guard) | |
| castle(noun, defense, refuge, fortification, stronghold) | |
| fixedness | |
| fixity | |
| rapidity(noun, haste) | |
| secureness | |
| security(noun, support, control, change, cover) | |
| soundness(noun, support, control, change, strength) | |
| constancy(noun, support, control, strength, balance) | |
| fixture | |
| garrison(noun, cover, keep, position, guard) | |
| hold(noun, verb, keep, defense, stronghold) |
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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> |