Here's how it works:
* Verb: Admonish (to warn or reprimand someone firmly)
* Past Participle: Admonished (used to form perfect tenses, e.g., "He had been admonished" or as an adjective, e.g., "the admonished student")
So, while it comes from a verb, "admonished" can function as both a verb and an adjective depending on the context.