Which states of matter do not have a definite shape?

The answer is solid state. Other states don't have definite shape. While liquid state takes the shape if its container, the gaseous state seems not to agree with its container (smiles) because of its continously rapid brownian/random.

Gases do not have a fixed volume and therefore cannot be contained - they do not have a definite shape. Liquids do not have a definite shape but they do take the shape of the container because they have a fixed volume. Only solids have a definite shape.

Gasses and liquids don't have a fixed shape because there is lots of space between the particles therefore particles can move and not keep a definate shape