terrible in WordNet English dictionary

1. exceptionally bad or displeasing
   "atrocious taste"; "abominable workmanship"; "an awful voice"; "dreadful manners"; "a painful performance"; "terrible handwriting"; "an unspeakable odor came sweeping into the room"
   atrocious  abominable  awful  dreadful  painful  terrible  unspeakable 
   
2. causing fear or dread or terror
   "the awful war"; "an awful risk"; "dire news"; "a career or vengeance so direful that London was shocked"; "the dread presence of the headmaster"; "polio is no longer the dreaded disease it once was"; "a dreadful storm"; "a fearful howling"; "horrendous explosions shook the city"; "a terrible curse"
   awful  dire  direful  dread  dreaded  dreadful  fearful  fearsome  frightening  horrendous  horrific  terrible 
   
3. extreme in degree or extent or amount or impact
   "in a frightful hurry"; "spent a frightful amount of money"
   frightful  terrible  awful  tremendous 
   
4. intensely or extremely bad or unpleasant in degree or quality
   "severe pain"; "a severe case of flu"; "a terrible cough"; "under wicked fire from the enemy's guns"; "a wicked cough"
   severe  terrible  wicked