The Nastiest Word in the English Language

There is one four letter word in our language that has caused more failure, and more disappoinment than drinking, drugs, disease or any other factor.
You don't even have to say it; Just thnking the word can easily doom a person to failure! By refusing to let this one word enter your thoughts you can greatly
increase your chances for success in any endeavor.
By simply removing the last letter, before saying, or
thinking the word you can almost guarantee success!!
Dare I print the word here?