"inactive" internet accounts

Hello Steel Dragon,

Thank you for using Apple Support Communities!

I understand from your post that you would like to remove an inactive account from the Internet Accounts settings. This article will provide you with the steps to remove an account under the heading, "Stop using an account", which you may find helpful:

Use your internet accounts on Mac - Apple Support

Best Regards.

if you delete the google account from the server permanently it will show google inactive in internet accounts , even you tap it and click on subtract sign , it will be removed temporarily but will appear after sometime .

Don't try to remove the old mail address from keychain access , you might corrupt the keychain , even you delete it will reappear in internet accounts .

May be if you erase the hard drive and reinstall os it might be removed and that is not sure .