**False.**

**Explanation:**

**Density** is defined as the mass of an object divided by its volume. It is a measure of how much matter is packed into a given space. The formula for density is:

Density = Mass / Volume

1. **Definition of density:**

Density refers to how much mass is contained within a given volume. It is a property of matter that describes the compactness of an object. The denser an object is, the more mass it contains in a given space.

2. **Density and highly dense objects:**

Highly dense objects have a higher density. This means that they contain more mass in a given volume compared to less dense objects. For example, a small piece of lead is much denser than a larger piece of foam, as the lead has more mass packed into a smaller volume.

3. **Density and less dense objects:**

Less dense objects have a lower density. This means that they contain less mass in a given volume compared to more dense objects. For example, a larger piece of foam is much less dense than a small piece of lead, as the foam has less mass packed into a larger volume.

4. **Relationship between density and volume:**

Density is inversely proportional to volume. This means that as the volume of an object increases, the density decreases, assuming the mass remains constant. Similarly, if the volume decreases, the density increases.

This relationship can be understood by considering the formula for density:

Density = Mass / Volume

If the mass of an object remains constant and the volume increases, the density decreases because the same amount of mass is spread over a larger volume. Conversely, if the volume decreases, the same amount of mass is packed into a smaller volume, resulting in a higher density.

In summary, highly dense objects have a higher density, not less density. The density of an object is determined by the amount of mass it contains in a given volume. The larger the mass in a given volume, the higher the density.