| mentally strange(expression, silly, foolish, mad, insane) | |
| neurotic | |
| nutty as fruitcake(expression, idiom, silly, foolish, mad) | |
| off-the-wall | |
| off one's chump | |
| off one's rocker | |
| personal quality(adjective, feature, characteristic, attribute, own) | |
| philosophic(adjective, reasoning, intellectual) | |
| psychoanalytical(adjective, psychical) | |
| psychoneurotic | |
| psychopath | |
| queer | |
| quirky | |
| reasonless | |
| reflecting | |
| round the bend(expression, idiom, silly, foolish, mad) | |
| ruminant | |
| ruminating | |
| screw loose(expression, silly, foolish, mad, insane) | |
| serious |
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| APA | Smart Define. (2015). mental thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/mental/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "mental thesaurus" https://smartdefine.org/mental/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, mental thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/mental/thesaurus/synonyms>. |
| MLA | Smart Define. "mental thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/mental/thesaurus/synonyms> |