I tried taking some songs off my phone, I deleted them from the library on my computer but they're still showing up on my phone?

I tried to take some songs off my phone that I no longer wanted. I unchecked them just in case I wanted them back on later, but they would not remove. So I just deleted them from my library on my computer, but for some reason they are still showing up on my phone with no option to delete. When I plug my phone into my computer they're not showing up in the library anywhere. How do I get these songs to come off my phone?