causeless (
http://definr.com/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]