Dissatisfied (not “disatisfied”) applies to people who are unhappy, frustrated, or disappointed with someone or something:
- Professor Bower was dissatisfied with her students’ poor essays.
- The company’s dissatisfied employees organized a boycott.
- We were dissatisfied with our insurance company’s customer service.
- She was completely dissatisfied with his attitude.
Unsatisfied refers to the feeling of wanting more of something:
- The restaurant’s delicious but meager appetizers left us hungry students unsatisfied; we wanted more of everything.
- I was unsatisfied with the game’s intriguing demo: it was too short.
- I was completely unsatisfied with my 15-minute nap, so I’m going to sleep some more.