• 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"
• requiring effort or concentration; complex and not easy to answer or solve; "raised Serious objections to the proposal"; "the plan has a Serious flaw"
• of great consequence; "marriage is a Serious matter"
• appealing to the mind; "good music"; "a Serious book"
• 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!"
• completely lacking in playfulness

'Serious' in other languages