1. Sand: Sand is made of tiny pieces of rock and minerals, and its particles are too large to be surrounded by water molecules.

2. Oil: Oil and water are immiscible, meaning they don't mix. Oil is less dense than water, so it floats on top.

3. Plastic: Most plastics are not soluble in water.

4. Wood: Wood is primarily composed of cellulose, which is a complex carbohydrate that doesn't dissolve in water.

5. Metals: Most metals, like iron, gold, and silver, do not dissolve in water.

6. Glass: Glass is made of silica, which is not soluble in water.

7. Rubber: Rubber is made of polymers that don't dissolve in water.

8. Diamond: Diamonds are made of pure carbon and are incredibly hard. They don't dissolve in water.

9. Pebbles: Similar to sand, pebbles are too large and dense to dissolve in water.

10. Paper: Paper is made of cellulose fibers, which are not easily dissolved in water.

It's important to note that some substances might be slightly soluble in water, but they won't dissolve completely.