Serious
[adj] 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"
[adj] requiring effort or concentration; complex and not easy to answer or solve; "raised serious objections to the proposal"; "the plan has a serious flaw"
[adj] of great consequence; "marriage is a serious matter"
[adj] appealing to the mind; "good music"; "a serious book"
[adj] 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!"
[adj] completely lacking in playfulness
Related Information
Synonyms
capital, critical, dangerous, difficult, earnest, good, grave, grievous, hard, important, in earnest(p), intellectual, of import, overserious, real, sedate, sensible, severe, sincere, sober, sobering, solemn, thoughtful, unplayful