What does CASUAL mean?

adjective

1. marked by blithe unconcern“an ability to interest casual students”
2. without or seeming to be without plan or method; offhand“a casual remark”
3. appropriate for ordinary or routine occasions“casual clothes”
4. occurring or appearing or singled out by chance“seek help from casual passers-by”
5. hasty and without attention to detail; not thorough“a casual (or cursory) inspection failed to reveal the house's structural flaws”
6. occurring from time to time“casual employment”
7. characterized by a feeling of irresponsibility“a broken back is nothing to be casual about; it is no fooling matter”
8. natural and unstudied“using their Christian names in a casual way”