Main entry: dangerous, grave, grievous, life-threatening, serious, severe
Definition: causing fear or anxiety by threatening great harm
Usage: 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
Main entry: serious
Definition: requiring effort or concentration; complex and not easy to answer or solve
Usage: raised serious objections to the proposal; the plan has a serious flaw
Main entry: serious
Definition: of great consequence
Usage: marriage is a serious matter
Definition: appealing to the mind
Usage: good music; a serious book
Main entry: serious
Definition: concerned with work or important matters rather than play or trivialities
Usage: 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!
Main entry: sober, serious, unplayful
Definition: completely lacking in playfulness