104 entries under impassive topic. ×
| imperturbable(adjective, calm, cool, sensible, dark) | |
| poker-faced(adjective, deadpan, stony, unsmiling) | |
| practical(adjective, calm, tough, plain, dark) | |
| quiet(adjective, calm, cool, severe, gentle) | |
| reasonable(adjective, calm, keen, sensible, restrained) | |
| sound(adjective, calm, strong, honest, solid) | |
| aloof(adjective, calm, restrained, subdued) | |
| deadpan(adjective, set, tough, severe, honest) | |
| rational(adjective, calm, reasonable, keen, dark) | |
| realistic(adjective, calm, tough, sensible, dark) | |
| reserved(adjective, calm, sensible, restrained, modest) | |
| restrained(adjective, calm, quiet, gentle, sensible) | |
| stolid(adjective, tough, rational, straightforward, sober) | |
| abstaining(adjective, calm, sensible, dark, restrained) | |
| apathetic(adjective, tough, rational, straightforward, sober) | |
| clear-headed(adjective, calm, sensible, dark, restrained) | |
| cold(adjective, calm, close, hard, tough) | |
| cold-blooded(adjective, tough, rational, straightforward, sober) | |
| disciplined(adjective, calm, sensible, restrained, alert) | |
| dispassionate(adjective, calm, cool, relaxed, restrained) |
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| APA | Smart Define. (2016). serious thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/serious/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "serious thesaurus" https://smartdefine.org/serious/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2016, serious thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/serious/thesaurus/synonyms>. |
| MLA | Smart Define. "serious thesaurus" 24 February 2016. Web. 26 September 2026. <https://smartdefine.org/serious/thesaurus/synonyms> |