When I'm used, I'm useless, once offered, soon rejected. In desperation oft expressed, the intended not protected. What am I?

Answer: A poor alibi or excuse.

More Difficult Riddles with answers

More Difficult Riddles

When it comes in, From sea to shore, Twenty paces you'll see, No less, no more.
When it is alive we sing, when it is dead we clap our hands. What is it?
When John was six years old he hammered a nail into his favorite tree to mark his height. Ten years later at age sixteen, John returned to see how much higher the nail was. If the tree grew by five centimeters each year, how much higher would the nail be?
When the celebrated German mathematician Karl Friedrich Gauss (1777-1855) was nine he was asked to add all the integers from 1 through 100. He quickly added 1 to 100, 2 to 99, and so on for 50 pairs of numbers each adding to 101. Answer: 50 X 101=5,050. What is the sum of all the digits in integers from 1 through 1,000,000,000? (That's all the digits in all the numbers, not all the numbers themselves.)
When the creeper passes, all the grass kneels
When the day after tomorrow is yesterday, today will be as far from Wednesday as today was from Wednesday when the day before yesterday was tomorrow. What is the day after this day?
When the horse strokes the cat, the wood begins to sing.
Where do you go in through one hole and come out through two holes at the same time?
Where humans breath liquid?
Which button does not function when being pressed?
Which word contains 26 letters but only three syllables?
While playing with a metal washer shaped like a ring, Dave accidently pushed it on his finger too far and couldn't get it off. Trying to remove it using soap and water didn't work. The hospital sent him to a service station thinking they could cut the metal. Since the ring was made with a specially hardened steel, it couldn't be cut. Just then Bob arrived on the scene and suggested an easy way to remove the washer in just a few minutes. What was his solution?