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English word serious comes from Proto-Indo-European *swēr-, and later Latin serius ((figurative) late, tardy, belated. Grave, earnest, serious.)
*swēr- (Proto-Indo-European)
heavy
serius (Latin)
(figurative) late, tardy, belated. Grave, earnest, serious.
sēriōsus (Malayalam)
serieux (Old French)
seryows (Middle English)
serious (English)
Important; weighty; not insignificant. Really intending what is said; in earnest; not jocular or deceiving. Without humor or expression of happiness; grave in manner or disposition.