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From The Collaborative International Dictionary of English v.0.48:
Serious \Se"ri*ous\, a. [L. serius: cf. F. s['e]rieux, LL. seriosus.] 1. Grave in manner or disposition; earnest; thoughtful; solemn; not light, gay, or volatile. [1913 Webster] He is always serious, yet there is about his manner a graceful ease. --Macaulay. [1913 Webster] 2. Really intending what is said; being in earnest; not jesting or deceiving. --Beaconsfield. [1913 Webster] 3. Important; weighty; not trifling; grave. [1913 Webster] The holy Scriptures bring to our ears the most serious things in the world. --Young. [1913 Webster] 4. Hence, giving rise to apprehension; attended with danger; as, a serious injury. [1913 Webster] Syn: Grave; solemn; earnest; sedate; important; weighty. See Grave. [1913 Webster] -- Se"ri*ous*ly, adv. -- Se"ri*ous*ness, n. [1913 Webster]