This is the only letter in past perfect noun that could predict the future as far as the termination of a human episode to a certain epoch in one's life, for example here on is able to note that such a person if he or she do like this then their effort will be wasted. But having accepted such a notion it does come to be natural that such a wasted life is not worth waste time upon it, but then when this word wasted turned to future perfect noun it will be immersed with uncertainty for example here a future that is wasted is not worth to waste time about it.

DR.HASHIM S.H. BEHBEHANI