Serious /(?)/

Se·ri·ous

Serious

a.
  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.
  2. Really intending what is said; being in earnest; not jesting or deceiving.
  3. Important; weighty; not trifling; grave.
    The holy Scriptures bring to our ears the most serious things in the world.
  4. Hence, giving rise to apprehension; attended with danger; as, a serious injury.