Main entry: reasonless, causeless
Definition: having no justifying cause or reason
Usage: a senseless, causeless murder; a causeless war that never had an aim; an apparently arbitrary and reasonless change
Main entry: reasonless
Definition: not endowed with the capacity to reason
Usage: a reasonless brute
Main entry: reasonless, mindless, senseless
Definition: not marked by the use of reason
Usage: mindless violence; reasonless hostility; a senseless act