To help you find the correct word, please provide more context. What were you trying to say when you used "falsay"?
For example:
* Were you trying to describe a false statement? In that case, you could use words like "lie," "fabrication," "deception," or "untruth."
* Were you trying to describe a false belief? You could use words like "misconception," "delusion," or "fallacy."
* Were you trying to describe something that is not genuine? You could use words like "fake," "counterfeit," or "imitation."
Once you provide more context, I can give you a more accurate answer.