serious

/ˈsɪə.ɹi.əs/

adjective

Without humor or expression of happiness; grave in manner or disposition
"It was a surprise to see the captain, who had always seemed so serious, laugh so heartily."
Similar: earnest, solemn
Important; weighty; not insignificant
"This is a serious problem. We'll need our best experts."
Really intending what is said (or planned, etc); in earnest; not jocular or deceiving
"After all these years, we're finally getting serious attention."

adverb

Practice "serious" in context

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