Synset

causing fear or anxiety by threatening great harm
<adj.all>   freq. cnt.: 10 freq. cnt.: 4 freq. cnt.: 3 freq. cnt.: 1 freq. cnt.: 1 freq. cnt.: 1

dangerous

grave

grievous

life-threatening

serious

severe

sample sentences

"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"