In Gmail, how can I search for conversations that have no label?

I know how to search for all mail items with a given label, i.e. ‘in:jobs’ or ‘label:personal.’ But how can I search for unlabeled items?

on the top of gmail when you’re logged in, you will see "Show search options",click on that and then just put in some of the text that was in said e-mail and it will find it! I use the search option ALL the time! Love it!