| 10 | |
| incognito(adjective, strange, new, unknown, undisclosed) | |
| ecstasy | |
| tenner | |
| decade | |
| ten | |
| whatchamacallit(noun, adjective, bar, unknown, undisclosed) | |
| scratch(noun, verb, remove, mark, draw) | |
| tick(noun, line, checkmark) | |
| unnamed(adjective, strange, unknown, indefinite, undisclosed) | |
| ex | |
| 10 | |
| Adam | |
| XTC | |
| cross(noun, verb, remove, continue, line) | |
| disco biscuit | |
| go | |
| hug drug | |
| unknown(adjective, obscure, strange, mysterious, indefinite) | |
| anonymous(adjective, strange, choice, unknown, indefinite) |
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| APA | Smart Define. (2015). X thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/x/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "X thesaurus" https://smartdefine.org/x/thesaurus/synonyms (accessed September 20, 2026). |
| Harvard | Smart Define 2015, X thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/x/thesaurus/synonyms>. |
| MLA | Smart Define. "X thesaurus" 27 October 2015. Web. 20 September 2026. <https://smartdefine.org/x/thesaurus/synonyms> |