From Middle English seryows, from Old French serieux, from Medieval Latin sēriōsus, an extension of Latin sērius (“grave, earnest, serious”), from Proto-Indo-European *swēr- (“heavy”). Cognate with German schwer (“heavy, difficult, severe”), Old English swǣr (“heavy, grave, grievous”). More at swear, sweer.
serious (comparative seriouser or more serious, superlative seriousest or most serious)
- Without humor or expression of happiness; grave in manner or disposition; earnest; thoughtful; solemn.
- It was a surprise to see the captain, who had always seemed so serious, laugh so heartily.
- Important; weighty; not trifling; leaving no room for play; needing great attention; critical.
- This is a serious problem. We'll need our best experts.
- Really intending what is said; being in earnest; not jesting or deceiving; meaningful.
- After all these years, we're finally getting serious attention.
without humor or expression of happiness
important; weighty; not trifling; leaving no room for play
really intending what is said; being in earnest