Indivisible (adjective)

1. Not able to be divided or separated into parts.
2. Not able to be broken or divided into smaller units.

Origin:

From in- + divisible.

Examples:

1. The country was indivisible and should not be divided.
2. The rock was indivisible and could not be broken.
3. The team is indivisible and works well together.
4. The indivisible atom is the building block of matter.
5. The indivisible unity of the nation must be preserved.