How to clear Email Address from Outlook ?

Hi friends I want to delete some of the email address from my Outlook. It takes a long time to search the address to whom I have to send the email and some of the added email address are of no longer useful to me .Can anyone tell me what the procedure to delete the email address from my Outlook.

One of the simple way is to arrow down the unwanted email address in the Autocomplete list and hit delete key.