| rabid(adjective, insane) | |
| rabies | |
| raging(adjective, insane) | |
| railway engine | |
| raving(adjective, insane) | |
| reasonless | |
| ridiculous | |
| rot | |
| roughened | |
| sappy | |
| scabies | |
| scatty | |
| schizo | |
| schizoid | |
| schizzo(crazy, insane, irrational, distracted, hacked) | |
| smitten | |
| squirrelly(adjective, slang, crazy, mad) | |
| stark-mad | |
| stark-staring mad | |
| strange |
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| APA | Smart Define. (2015). loco thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/loco/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "loco thesaurus" https://smartdefine.org/loco/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2015, loco thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/loco/thesaurus/synonyms>. |
| MLA | Smart Define. "loco thesaurus" 10 April 2015. Web. 24 September 2026. <https://smartdefine.org/loco/thesaurus/synonyms> |