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Adjective serious has 6 senses
  1. serious - concerned with work or important matters rather than play or trivialities; "a serious student of history"; "a serious attempt to learn to ski"; "gave me a serious look"; "a serious young man"; "are you serious or joking?"; "Don't be so serious!"
    frivolous, airheaded, dizzy, empty-headed, featherbrained, giddy, light-headed, lightheaded, silly, flighty, flyaway, flippant, light-minded, idle, light, trivial
  2. serious - of great consequence; "marriage is a serious matter"
    unimportant (indirect, via important)
  3. dangerous, grave, grievous, serious, severe, life-threatening - causing fear or anxiety by threatening great harm; "a dangerous operation"; "a grave situation"; "a grave illness"; "grievous bodily harm"; "a serious wound"; "a serious turn of events"; "a severe case of pneumonia"; "a life-threatening disease"
    Antonyms: noncritical, noncrucial (indirect, via critical)
  4. good, serious - appealing to the mind; "good music"; "a serious book"
    Antonym: nonintellectual (indirect, via intellectual)
  5. unplayful, serious, sober - completely lacking in playfulness
  6. serious - requiring effort or concentration; complex and not easy to answer or solve; "raised serious objections to the proposal"; "the plan has a serious flaw"
    easy (indirect, via difficult)
seriocomic seriocomical seriola seriola dorsalis seriola grandis seriola zonata serios serious-mindedness serious serious illness serious lapses serious music seriously seriouslyreally seriousness seriph seriphidium

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