资料来源 : pyDict

偶然的,碰巧的;临时的,不定期的;漫不经心的,随便的,非正式的

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Casual \Cas"u*al\, a. [OE. casuel, F. casuel, fr. L. casualis,
   fr. casus fall, accident, fr. cadere to fall. See {Case}.]
   1. Happening or coming to pass without design, and without
      being foreseen or expected; accidental; fortuitous; coming
      by chance.

            Casual breaks, in the general system. --W. Irving.

   2. Coming without regularity; occasional; incidental; as,
      casual expenses.

            A constant habit, rather than a casual gesture.
                                                  --Hawthorne.

   Syn: Accidental; fortutious; incidental; occasional;
        contingent; unforeseen. See {Accidental}.

Casual \Cas"u*al\, n.
   One who receives relief for a night in a parish to which he
   does not belong; a vagrant.

资料来源 : WordNet®

casual
     adj 1: 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" [syn: {insouciant}, {nonchalant}]
     2: without or seeming to be without plan or method; offhand; "a
        casual remark"; "information collected by casual methods
        and in their spare time"
     3: suited for everyday use; "casual clothes"; "everyday
        clothes" [syn: {everyday}]
     4: occurring or appearing or singled out by chance; "their
        accidental meeting led to a renewal of their friendship";
        "seek help from casual passers-by"; "a casual meeting"; "a
        chance occurrence" [syn: {accidental}, {chance(a)}]
     5: hasty and without attention to detail; not thorough; "a
        casual (or cursory) inspection failed to reveal the
        house's structural flaws"; "a passing glance";
        "perfunctory courtesy" [syn: {cursory}, {passing(a)}, {perfunctory}]
     6: employed in a specified capacity from time to time; "casual
        employment"; "a casual correspondence with a former
        teacher"; "an occasional worker" [syn: {occasional}]
     7: characterized by a feeling of irresponsibility; "a broken
        back is nothing to be casual about; it is no fooling
        matter" [syn: {fooling}]
     8: natural and unstudied; "using their Christian names in a
        casual way"; "lectured in a free-and-easy style" [syn: {free-and-easy}]
     9: not showing effort or strain; "a difficult feat performed
        with casual mastery"; "careless grace" [syn: {effortless}]