informal

adjective5

1. •
   Not formal or ceremonious.

   • Students and faculty members lunch at the cafeteria and naturally communicate freely with one another in a relaxed and informal setting. — 2019
2. •
   Suited for everyday use.

   • informal clothes
3. •
   Reflecting everyday, non-ceremonious usage.
4. •
   Not in accord with the usual regulations.
5. •
   Not organized; not structured or planned.