How to delete an App from Launchpad?

I installed Sims 3 from Origin. When it was installing, Origin quitted and an error said Sims 3 installation is unsuccesful. Then I saw Sims 3 icon on Launchpad. I clicked it and it said ''Unknown Error''. I tried to uninstall it with that ''cross'' but it didn't worked. I tried to drag it to trash, and I couldn't delete it from Application because IT'S NOT THERE. I uninstalled folder of Sims 3 and the icon is still there like a ghost. I cannot delete it from origin because origin thinks I installed it. Please help me and sorry for my bad english.

I am using rMBP Late 2013 with OS X 10.9.2
Thank you