Here's why and some options depending on the context:
* "Authorize" is a verb, not an adjective. Adverbs modify verbs, adjectives, or other adverbs.
* The meaning of "authorize" is already implied in many adverbs. For example, you might say something was "officially authorized" or "properly authorized".
Here are some alternatives you could use:
* "Officially" - This implies formal permission.
* "Explicitly" - This implies clear and direct authorization.
* "Solely" - This emphasizes that only a specific person or entity has the authority.
* "Explicitly" - This highlights the clarity of the authorization.
* "Specifically" - This focuses on the specific action being authorized.
* "Duly" - This emphasizes the proper process of authorization.
Example:
Instead of saying "The manager authorized the purchase," you could say:
* "The manager officially authorized the purchase."
* "The manager explicitly authorized the purchase."
* "The manager was solely authorized to approve the purchase."
The best adverb depends on the specific nuance you want to convey.