Most of the time, the unread emails become a source of much nuisance if they are in large numbers. However, it is not difficult to delete all of them in a matter of seconds. It will take you only a few steps within your Gmail account to get it done.
Sign into your Gmail Account.
Locate the Search bar at the top and type in:inbox is:unread and enter.
Select all emails with the button up there. Don’t forget to ensure that all unread messages are selected on the page.
Click Select all conversations that match this search. All unread emails will be selected.
Now Hit Delete Button and All the Unread and unwanted emails will go away from your inbox. You’re done.