Wild thing is an informal term used to describe a person or an animal that is untamed, unrestrained or unpredictable in behavior. There are several synonyms that can be used to describe this kind of behavior such as feral, lawless, uncontrolled, uncontrollable, fierce, savage, dangerous, ferocious, and out of control. Each of these words carries slightly different connotations and shades of meaning, but they all capture the essence of wildness. Whether referring to a wild animal in the jungle or a rebellious teenager, these synonyms can effectively convey the sense of untamed energy and unpredictability associated with the term "wild thing".