dangerous in WordNet English dictionary

1. involving or causing danger or risk; liable to hurt or harm
   "a dangerous criminal"; "a dangerous bridge"; "unemployment reached dangerous proportions"
   dangerous  unsafe 
   
2. 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"
   dangerous  grave  grievous  serious  severe  life-threatening