| cool(adjective, calm, steady, collected, unflappable) | |
| faith(noun, drive, determination, resolution, steadfastness) | |
| firmness(noun, drive, determination, resolution, steadfastness) | |
| level-headed(calm, cool, unflappable) | |
| motivation(noun, drive, determination, resolution, steadfastness) | |
| serene(calm, cool, unflappable) | |
| steady(calm, cool, unflappable) | |
| strength of character(noun, expression, idiom, resolve, purpose) | |
| strength of mind(noun, expression, idiom, resolve, purpose) | |
| tranquil(adjective, calm, cool, steady, unaffected) | |
| unflustered(calm, cool, unflappable) | |
| unruffled(adjective, calm, cool, steady, collected) | |
| will(noun, drive, determination, resolution, steadfastness) |
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| APA | Smart Define. (2016). stiff upper lip thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/stiff_upper_lip/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "stiff upper lip thesaurus" https://smartdefine.org/stiff_upper_lip/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2016, stiff upper lip thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/stiff_upper_lip/thesaurus/synonyms>. |
| MLA | Smart Define. "stiff upper lip thesaurus" 25 February 2016. Web. 24 September 2026. <https://smartdefine.org/stiff_upper_lip/thesaurus/synonyms> |