To properly delete the application from your Mac, do the following:
Open a terminal and type
mdfind -name "application name" where you replace application name with the name of the app.
Once it finds some results, use
rm -rif PATH where PATH is the path per line it displays from the command above.
Note: You might have to use SUDO in front of each command to give the command exclusive access. When it finishes, reboot the Mac and the app should be deleted.