Synonyms: 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
Similar words: critical
Definition: being in or verging on a state of crisis or emergency
Usage: a critical shortage of food; a critical illness; an illness at the critical stage