involving or causing danger or risk; liable to hurt or harm; a dangerous criminal; a dangerous bridge; unemployment reached dangerous proportions

[ Syn: unsafe ]

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

[ Syn: grave , grievous , serious , severe , life-threatening ]