Synset

intensely or extremely bad or unpleasant in degree or quality
<adj.all>   freq. cnt.: 10 freq. cnt.: 8 freq. cnt.: 1 freq. cnt.: 1

severe

terrible

wicked

sample sentences

"severe pain"
"a severe case of flu"
"a terrible cough"
"under wicked fire from the enemy's guns"
"a wicked cough"