Definitions:

1. closed or secured with or as if with a seal adjective
   • my lips are sealed
2. covered with a waterproof coating adjective
   • a sealed driveway
3. determined irrevocably adjective
   • Their fate is sealed.
4. established irrevocably adjective
   • I like to think my fate is not sealed.
5. undisclosed for the time being adjective
   • sealed orders

Synonyms:

• certain
• made-up
• plastered