Here are some ways to think about it:
* Full of energy: An enthusiastic person is full of energy and excitement, eager to get involved and make things happen.
* Passionate: They have a strong passion for something, whether it's a hobby, a project, or a cause.
* Excited and eager: They are excited and eager to learn, participate, or contribute.
* Positive and optimistic: They often have a positive and optimistic outlook and are easily motivated.
For example:
* "She was enthusiastic about her new job."
* "The crowd was enthusiastic about the band's performance."
* "He was an enthusiastic supporter of the local charity."
Note: "Ethusiastic" is not a real word. The correct spelling is enthusiastic.