Here's why:
* Abstract nouns represent concepts, qualities, or ideas that cannot be touched or seen. Examples include: *love*, *justice*, *freedom*, *happiness*.
* Adjectives describe nouns, giving more information about them. They answer questions like "what kind?" or "which one?".
Example:
* Sophisticated technology (technology is the noun, sophisticated describes it)
Therefore, "sophisticated" modifies a noun and provides information about it, making it an adjective.