Crooked as a rainbow, and slick as a plate, Ten thousand horses can't pull it straight.

Answer: river

More Difficult Riddles with answers

More Difficult Riddles

Describes a mysterious region and a stylish pair of shorts.
Describes universities like Harvard and can be poisonous.
Dies half its life. Lives the rest. Dances without music. Breathes without breath.
Different lights do make me strange, thus into different sizes I will change
Different lights do make me strange, thus into different sizes I will change. What am I?
Do what he says and you'll be fine, don't and you lose the game.
Do you know what you can hold without ever touching it?
Don't do this in the shallow end.
Draw four rectangles on a piece of paper. Put nine x's in the four rectangles so that there is an uneven number of x's in each rectangle.
During the 1800's these turned women into hourglasses and is becoming more popular again these days
Each of these ends in a kettle full of precious metal and the double variety is quite awesome
Eight years ago, Bill was eight times the age of his son Bill Jr. Today, if you add their ages together, they add up to 52. How old are Bill and his son?