Definition of casual
without or
seeming to be without
plan or method; offhand; "a casual remark"; "information
collected by casual methods and in their
spare time"
occurring or
appearing or singled out by chance; "seek
help from casual passers-by"; "a casual meeting"; "a
chance occurrence"
natural and unstudied; "using their Christian
names in a casual way"; "lectured in a free-and-easy style"