Se″ri‐ous (?), a. [L. serius: cf. F. sérieux, LL. seriosus.] 1. Grave in manner or disposition; earnest; thoughtful; solemn; not light, gay, or volatile.
He is always serious, yet there is about his manner a graceful ease. Macaulay.
2. Really intending what is said; being in earnest; not jesting or deceiving. Beaconsfield.
3. Important; weighty; not trifling; grave.
The holy Scriptures bring to our ears the most serious things in the world. Young.
4. Hence, giving rise to apprehension; attended with danger; as, a serious injury.
Syn. — Grave; solemn; earnest; sedate; important; weighty. See Grave.
— Se″ri‐ous‐ly, adv. — Se″ri‐ous‐ness, n.