Arnold Schwarzenegger Won't Say He 'Betrayed' Maria Shriver

Arnold Schwarzenegger is out hawking his autobiography, so he knows something about words ... and the one word he WON'T use to describe his affair with the maid is "BETRAYAL."

In an interview on "60 Minutes" which will air Sunday, Lesley Stahl said to Arnold ...

"She gave up her television career for you. I mean, wow, was this the most unbelievable act of betrayal to Maria?"

Arnold would not acknowledge Stahl's question. Instead he deflected by saying, "I think it was the stupidest thing I've done in the whole relationship. It was terrible I inflicted tremendous pain on Maria and unbelievable pain on the kids."

And it's even worse. Arnold has not even shown the book to Maria. When Stahl asked if she knew what Arnold had written, all he would say was, "She knows that it's about my whole life."