- Definitions|3
- Thesaurus|610
- Abbreviations|0
102 entries under noun topic. ×
| secret agent(expression, plant, agent, operative) | |
| secret service(expression, plant, agent, operative) | |
| sleuth(plant, agent, operative, informer) | |
| slim chance(expression, unknown, doubtfulness, underdog) | |
| small chance(expression, unknown, doubtfulness, underdog) | |
| smash(informal, thrive, dazzling) | |
| snoop(plant, agent, operative, informer) | |
| spook(plant, agent, operative, informer) | |
| spotter(plant, agent, spy, operative) | |
| stalking horse(expression, unknown, doubtfulness, underdog) | |
| standoff | |
| ten-strike(informal, thrive, dazzling) | |
| undercover agent(expression, plant, agent, operative) | |
| underdog(unknown, doubtfulness, improbability, also-ran) | |
| unexpected winner(expression, unknown, doubtfulness, underdog) | |
| unknown(doubtfulness, underdog, improbability, also-ran) | |
| unknown quantity(expression, unknown, doubtfulness, underdog) | |
| unlikelihood(unknown, doubtfulness, underdog, improbability) | |
| unlikely winner(expression, unknown, doubtfulness, underdog) | |
| upsetter(unknown, doubtfulness, underdog, improbability) |
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| APA | Smart Define. (2015). sleeper thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/sleeper/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "sleeper thesaurus" https://smartdefine.org/sleeper/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2015, sleeper thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/sleeper/thesaurus/synonyms>. |
| MLA | Smart Define. "sleeper thesaurus" 14 April 2015. Web. 25 September 2026. <https://smartdefine.org/sleeper/thesaurus/synonyms> |