Here, we have a collection of more than 30 cool riddles for adults! These brain teasers are designed to challenge your mind and entertain you at the same time. So, let's embark on this journey of solving cool riddles for adults together and see if you can unravel them all!

1. What gets shorter as it grows older?
2. What begins with an "e" and only contains one letter?
3. What can you find in a cupboard that can never be put in a saucepan?
4. What gets smaller every time it takes a bath?
5. I can be hot, I can be cold, I can run, and I can be still, I can be hard, and I can be soft. What am I?
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6. I’m not alive, but I can grow; I don’t have lungs, but I need air; I don’t have a mouth, but water kills me. What am I?
7. What is seen in the middle of March and April that can’t be seen at the beginning or end of either month?
8. I can be long or short; I can be grown or bought; I can be painted or left bare; I can be round or square. What am I?
9. I can travel at nearly 100 miles per hour but never leave the room. What am I?
10. I can be written, I can be spoken, I can be exposed, I can be broken. What am I?
11. I start with “M,” end with “X,” and have a never-ending amount of letters. What am I?
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12. I have lakes with no water, mountains with no stone, and cities with no buildings. What am I?
13. You see me once in June, twice in November, and not at all in May. What am I?
14. I follow you all the time and copy your every move, but you can’t touch me or catch me. What am I?
15. I go in hard, come out soft, and am never the same. What am I?
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16. What goes up and down, but always remains in the same place?
17. I fly without wings, I cry without eyes. Wherever I go, darkness follows me. What am I?
18. I am taken from a mine and shut up in a wooden case, from which I am never released, and yet I am used by almost every person. What am I?
19. The person who makes it, sells it. The person who buys it never uses it. The person who uses it never knows they're using it. What is it?
20. What's always running but never gets hot?