1. intensely or extremely bad or unpleasant in degree or quality

- severe pain

- a severe case of flu

Similar word(s): intense, terrible, wicked

2. very strong or vigorous

- a severe blow

Similar word(s): strong, hard, knockout

3. severely simple

Similar word(s): plain, austere, stark, stern

4. strict and uncompromising in discipline or judgment

- a parent severe to the pitch of hostility

- a hefty six-footer with a rather severe mien

Similar word(s): nonindulgent, strict, spartan

5. causing fear or anxiety by threatening great harm

- a severe case of pneumonia

Similar word(s): critical, dangerous, grave, grievous, serious

6. very bad in degree or extent

- a severe worldwide depression

- the house suffered severe damage

Similar word(s): bad