1. subject to, resulting from, or occurring by chance
a casual meeting
2. occurring without regularity occasional
casual employment
3. employed for irregular periods
a casual worker
4. met with on occasion and known only superficially
a casual friend
5. feeling or showing little concern nonchalant
a casual approach to cooking
6. lacking a high degree of interest or devotion
casual sports fans casual readers
7. done without serious intent or commitment
casual sex
8. informal, natural
a casual conversation
9. designed for informal use
casual clothing
10. allowing for the wearing of informal clothes
… I had my wedding skirt (yep, skirt—it was a casual wedding) …
— Rory Evans casual Fridays [=Fridays when employees (as in an office) are allowed to wear casual clothing]
11. a casual (see casual entry 1 sense 2b) or migratory worker
12. an officer or enlisted person awaiting assignment or transportation to a unit
13. happening by chance not planned or expected
14. designed for or permitting ordinary dress, behavior, etc. not formal
15. done without much thought, effort, or concern
16. happening unexpectedly or by chance not planned or foreseen
a casual meeting
17. occurring without regularity occasional
casual visits
18. showing or feeling little concern nonchalant
This is awful! How can you be so casual about it?
19. meant for informal use
Wear casual clothing for the tour.
20. not expected or foreseen
21. not done purposefully accidental
22. engaging in an activity on an occasional basis
a casual seller