What is the past tense of loud?

The word "loud" is an adjective, describing a sound's intensity. It doesn't have a past tense because it's not a verb.

If you're looking for a past tense related to the concept of loudness, you might be thinking of:

* "Was loud": This describes a sound's intensity in the past. For example, "The music was loud last night."

* "Shouted": This is a verb that describes a specific action of making a loud sound. For example, "He shouted across the room."

* "Made a loud noise": This describes an action of creating a loud sound. For example, "The car made a loud noise as it started."

Let me know if you have another word or concept in mind, and I'll be happy to help!