What are the opposite words for yahoo?

Yahoo is a word used to describe an enthusiastic, loud, and energetic person. However, there are also several antonyms that can be used to describe someone who is the opposite of a yahoo. One such antonym is mellow, which describes a person who is relaxed and laid back. Another antonym is subdued, which describes a person with a calm and reserved personality. Serene is also an antonym that can be used to describe someone who is peaceful and calm. While a yahoo is known for their wild and over-the-top behavior, these antonyms describe individuals who are more composed and steady in their demeanor.