severe

[səˈvir]

Definition:
1. Very serious or difficult.
2. Causing great pain, difficulty, damage, etc.

Use 'severe' in a sentence:

1. The severe thunderstorm caused so much damage that recovery would take years.
2. The family faced severe challenges when he lost his job.
3. Something that happens to you that is severe or unfair.
4. The thunderstorms are very severe, I have seen lightning countless times tonight.