causeless
 (a.)無顯著原因的,偶然的


 Cause·less, a. 1. Self-originating; uncreated.
 2. Without just or sufficient reason; groundless.
    My fears are causeless and ungrounded.   --Denham.


 Cause·less, adv. Without cause or reason.

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 causeless
      adj 1: having no justifying cause or reason; "a senseless,
             causeless murder"; "a causeless war that never had an
             aim"; "an apparently arbitrary and reasonless change"
             [syn: reasonless]
      2: having no cause or apparent cause; "a causeless miracle";
         "fortuitous encounters--strange accidents of fortune"; "we
         cannot regard artistic invention as...uncaused and
         unrelated to the times" [syn: fortuitous, uncaused]