dangerous

Adjective

• 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
    

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

Related words

• Synonyms: 
  grave , grievous , serious , severe , life-threatening , unsafe