What a descriptive word formed from proper noun?

You're asking for a proper adjective, which is an adjective formed from a proper noun.

Here are some examples:

* Shakespearean (from Shakespeare)

* Victorian (from Queen Victoria)

* Roman (from Rome)

* French (from France)

* Canadian (from Canada)

* Einsteinian (from Albert Einstein)

* Amazonian (from the Amazon River)

Proper adjectives are often used to describe things related to the person, place, or thing the proper noun refers to. For example, "Shakespearean plays" refers to plays written by William Shakespeare.

Let me know if you'd like to see more examples!