Something casual is ordinary or everyday — not too special, unusual, fancy, serious, or eventful. You might have a casual conversation with your classmates before homeroom, or attend a casual backyard barbecue.

If you're going to your friend's house for a dinner of pizza and soda, you could describe the evening as a casual night at home. Formal attire might mean tuxedos and evening gowns, but casual clothing is the kind of clothing you wear every day, for ordinary activities. If you treat a person or a subject in a casual way, you're not paying close attention or treating them as special. And you might remind your siblings to act casual on the day of your mom's surprise birthday party so that they don't ruin the surprise.

Definitions of casual
  1. adjective
    without or seeming to be without plan or method; offhand
    “a casual remark”
    “information collected by casual methods and in their spare time”
    without apparent forethought or prompting or planning
  2. adjective
    marked by blithe unconcern
    “an ability to interest casual students”
    “showed a casual disregard for cold weather”
    synonyms: insouciant, nonchalant
    lacking in interest or care or feeling
  3. adjective
    natural and unstudied
    “using their Christian names in a casual way”
    synonyms: free-and-easy
    not formal
  4. adjective
    not showing effort or strain
    “a difficult feat performed with casual mastery”
    synonyms: effortless
    posing no difficulty; requiring little effort
  5. adjective
    hasty and without attention to detail; not thorough
    “a casual (or cursory) inspection failed to reveal the house's structural flaws”
    synonyms: cursory, passing, perfunctory
    marked by lack of attention or consideration or forethought or thoroughness; not careful
  6. adjective
    characterized by a feeling of irresponsibility
    “a broken back is nothing to be casual about”
    synonyms: fooling
    psychologically light; especially free from sadness or troubles
  7. adjective
    appropriate for ordinary or routine occasions
    casual clothes”
    synonyms: daily, everyday
    not formal
  8. adjective
    occurring from time to time
    casual employment”
    “a casual correspondence with a former teacher”
    synonyms: occasional
    contrary to rule or accepted order or general practice
  9. adjective
    occurring or appearing or singled out by chance
    “seek help from casual passers-by”
    “a casual meeting”
    synonyms: chance
    without apparent forethought or prompting or planning
Word Family

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