Here's why:
* It describes a noun: Adjectives modify nouns or pronouns, providing more information about them. For example, you could say "the glorious sunset."
* It doesn't act as a verb, adverb, or conjunction: It doesn't express an action, modify a verb, or connect words or phrases.
It's important to note that "-glorious" is a suffix, meaning it is added to the end of a word to change its meaning. In this case, it is added to the word "glory" to create the adjective "glorious."