Neither bought nor sold but more valuable than gold. It is built but not by hand. What is it?

Answer: trust

More Difficult Riddles with answers

More Difficult Riddles

Never alive but practically extinct. How we miss the letters pressing the ribbon of ink. What is it?
Not a burden for its weight and daily carried out, He who takes it wishes it had never come about
Oh, what a surprise! Oh, what a miracle! It sprouted without a seed, It stood without a trunk. What is it?
On my own, I am darkness, a black abyss. But, Life brings me light with its gentle kiss. I am quiet and cold, but warmth I can hold. Alongside beauties and wonders, sights to be told. My surface may be bare, this I'm aware. But, beautiful secrets I am eager to share. My mouth so large, I swallow you whole. To be in my belly is your goal. What may lie within can drive men to sin. Greed and desire, gluttony's kin. For some, I am fear. For others, hope. My perception shaped from life's scope. From the earth I have come, and forever will stay, even if parts of me crumble away. What am I?
Once they sailed the sea, now they surf the web
One day a little boy named John went over to his parents and said that he wanted to shoot people and blow them up. His parents were really proud of his career choice. What does John want to do?
One fourth of the population of a newly discovered planet have 4 legs. The rest have two legs. There are 60 legs total. How big is the population of the newly discovered planet?
One sunny afternoon, three men go for a ride on a hot air balloon over the Sahara desert. An hour into the trip, the balloon begins to lose altitude. A month later, someone found one of the ballooners laying on the desert sand dead, naked, and holding half a toothpick. What happened to him?
Only one color, but not one size, Stuck at the bottom, yet easily flies. Present in sun, but not in rain, Doing no harm, and feeling no pain. What is it?
Only two backbones and thousands of ribs.
Pair me with baking, I turn from colored to white, I'm dirt cheap; in stores and restaurants I abound. When I use my alias I can make quite a noise, Or in music, a much more well-liked sound.
People are hired to get rid of me. I'm often hiding under your bed. In time I'll always return you see. Bite me and you're surely dead.