What Are The Two Words？

A very nice old lady had a few words to say to her granddaughter．

“My dear，” said the old lady，“I wish you would do something for me．

I wish you would promise me never to use two words．One is‘lousy’and the other is‘swell’．

Would you promise me that？ “Why，sure，Granny，”said the girl．“What are the two words？”