What word is not an adjective in this sentence The endless search for the Loch Ness monster often stirs Scottish interest?

The word that is not an adjective in the sentence is "often". Here's why:

* Adjectives describe nouns. In this sentence, the adjectives are:

* endless (describes the search)

* Scottish (describes interest)

* "Often" is an adverb. Adverbs modify verbs, adjectives, or other adverbs. In this sentence, "often" modifies the verb "stirs".