Hard to catch, easy to hold. Can't be seen, unless it's cold

Answer: breath

More Difficult Riddles with answers

More Difficult Riddles

Has feathers but can't fly. Rests on legs but can't walk.
Has no feet, but travels far. Is literate, but not a scholar. Has no mouth, yet clearly speaks.
He has married many women, but has never been married. Who is he?
He's dead with a metal bar across his back. When a woman sees him, she is very pleased. This was all perfectly legal. What's going on?
Held firmly in the hands, like a sword it cuts deep. Bloodless strokes, all, then forward we leap.
Hickory-Dickory-Dock! The mouse ran up the clock. The clock struck one and down did come. Hickory-Dickory-Dock! What am I?
His big belly supposedly has the ability to dispense good fortune.
Hold these between your knees if you want to set a Cuban beat.
Hoofed frolicking.
How can this be true? Have a look at the picture. All the lines are straight, the shapes that make up the top picture are the same as the ones in the bottom picture so where does the gap come from?
How can you burn an apple, blueberry, rose and pumpkin without leaving any ashes but retaining the smell of it?
How many cats are in a small room if in each of the four corners a cat is sitting, and opposite each cat there sit three cats, and a each cat's tail another is sitting?