How to permentaly delete songs off iphone 5?

Every time i delete my songs it keeps coming back when i plug into itunes its so annoying someone please help.

Put it in the microwave, it worked for me.

Delete them from itunes first or uncheck sync when the iphone is plugged to the computer.

There's an option in iTunes that allows you to manually manage your songs without iTunes symcing those songs back on your iPhone.