Definition of casual

• marked by blithe unconcern; "an ability to interest casual students"; "showed a casual disregard for cold weather"; "an utterly insouciant financial policy"; "an elegantly insouciant manner"; "drove his car with nonchalant abandon"; "was polite in a teasing nonchalant manner"
• without or seeming to be without plan or method; offhand; "a casual remark"; "information collected by casual methods and in their spare time"
• suited for everyday use; "casual clothes"; "everyday clothes"