01 a. Grave in manner or disposition; earnest; thoughtful; solemn; not light, gay, or volatile.
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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.
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2.
Really intending what is said; being in earnest; not jesting or deceiving.
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3.
Important; weighty; not trifling; grave.“The holy Scriptures bring to our ears the most serious things in the world.” — Young.
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4.
Hence, giving rise to apprehension; attended with danger; as, a serious injury.