The phrase "gentle as a lamb" is often used to describe someone who is calm, kind, and peaceful. However, there are several antonyms to this phrase that describe individuals who are anything but gentle. Some of these antonyms include "ferocious," "aggressive," "violent," "brutal," and "ruthless." These words describe individuals who are harsh, dangerous, and unpredictable. They are the polar opposite of someone who is "gentle as a lamb," and should be used carefully when describing someone's behavior or temperament. It is important to choose the right words to accurately convey a person's character, and these antonyms demonstrate how different words can have a powerful impact on meaning.