Source : Webster's Revised Unabridged Dictionary (1913)

Uncaused \Un*caused"\, a.
   Having no antecedent cause; uncreated; self-existent;
   eternal. --A. Baxter.

Source : WordNet®

uncaused
     adj : 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: {causeless}, {fortuitous}]