Here's why:
* Adverbs modify verbs, adjectives, or other adverbs. In this case, "intimately" would typically describe how an action is performed or the degree to which something is true.
* It ends in "-ly," which is a common characteristic of adverbs.
For example:
* "They intimately knew each other." (modifies the verb "knew")
* "He was intimately involved in the project." (modifies the adjective "involved")
* "They spoke intimately about their dreams." (modifies the verb "spoke")