569 entries under adjective topic. ×
| quick(adverb, activity, direct, express) | |
| rapid(adverb, direct, keen, express) | |
| speedy(adverb, direct, keen, express) | |
| swift(verb, adverb, activity, open) | |
| firm(noun, adverb, calm, close) | |
| persistent(strong, tough, strain, firm) | |
| stable(adverb, strong, secure, tough) | |
| strong(calm, secure, tough, continue) | |
| sound(characteristic, calm, strong, secure) | |
| expeditious(adverb, activity, prompt, quick) | |
| steadfast(characteristic, calm, close, strong) | |
| lasting(state, strain, firmness, labour) | |
| unfluctuating(calm, strong, secure, strain) | |
| hard(adverb, strain, firm, intense) | |
| stiff(great, secure, strain, firm) | |
| tight(adverb, close, strong, free) | |
| permanent(state, strain, firmness, labour) | |
| enduring(state, calm, close, strong) | |
| durable(calm, strong, secure, tough) | |
| substantial(calm, strong, secure, tough) |
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| APA | Smart Define. (2016). fast thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/fast/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "fast thesaurus" https://smartdefine.org/fast/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2016, fast thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/fast/thesaurus/synonyms>. |
| MLA | Smart Define. "fast thesaurus" 1 April 2016. Web. 22 September 2026. <https://smartdefine.org/fast/thesaurus/synonyms> |