Ustādh, my friend said he wanted to learn Arabic so I began teaching him, however I always tell him to the homework and practice vocabulary between lessons and he never does, and I have told him alot that if he’s serious then he has to do this, should I just stop teaching him as he seems unserious?

Ustadh AbdulAziz al-Haqqan

That is your decision and if you think he is wasting your time then yes you can.