- (a.) Important; weighty; not trifling; grave.
- (a.) Really intending what is said; being in earnest; not jesting or deceiving.
- (a.) Grave in manner or disposition; earnest; thoughtful; solemn; not light, gay or volatile.
- (a.) Hence, giving rise to apprehension; attended with danger; as, a serious injury.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). serious. Retrieved September 23, 2026, from http://smartdefine.org/serious/definitions/2060688 |
| Chicago | Webster's. 2011. "serious" http://smartdefine.org/serious/definitions/2060688 (accessed September 23, 2026). |
| Harvard | Webster's 2011, serious, Smart Define, viewed 23 September, 2026, <http://smartdefine.org/serious/definitions/2060688>. |
| MLA | Webster's. "serious" 28 May 2011. Web. 23 September 2026. <http://smartdefine.org/serious/definitions/2060688> |