If you say that something happened or was done for no reason, for no good reason, or for no reason at all, you mean that there was no obvious reason why it happened or was done. The guards, he said, would punch them for no reason.

What's a word for for no reason?

Consider gratuitously and unwarrantedly for "without any reason," and "unexplainedly" for without providing a reason. gratuitous: being without apparent reason, cause, or justification. unwarranted: without a basis for reason or fact; unjustified. unexplainedly: without explanation.

What no reason means?

DEFINITIONS1. used when you do not want to tell someone why you have done something. 'Why did you ask him that? ' 'No reason'.