Definitions of casual:

• adjective:   without or seeming to be without plan or method; offhand

  Example: "A casual remark"

• adjective:   employed in a specified capacity from time to time

  Example: "Casual employment"

• adjective:   hasty and without attention to detail; not thorough

  Example: "A casual (or cursory) inspection failed to reveal the house's structural flaws"

• adjective:   marked by blithe unconcern

  Example: "An ability to interest casual students"

• adjective:   not showing effort or strain

  Example: "A difficult feat performed with casual mastery"

• adjective:   suited for everyday use

  Example: "Casual clothes"

• adjective:   occurring or appearing or singled out by chance

  Example: "Seek help from casual passers-by"

• adjective:   natural and unstudied

  Example: "Using their Christian names in a casual way"

• adjective:   characterized by a feeling of irresponsibility

  Example: "A broken back is nothing to be casual about"