How to select all input text types NOT having a class already?

How to select all input text types NOT having a class already?

I have a form that has a bunch of text inputs, and I would like to select all that don't already have a class "errorClass" assigned to them.

My JQuery currently is:
  1. $('input[type="text"]').addClass("idleField");
But that adds the class "idleField" to ALL text fields, overriding the ones that already had the class "errorClass" assigned to it.

What is the proper syntax to add the "idleField" class to all text inputs that don't have the "errorClass" assigned?

Thanks,