The term "are inert" refers to objects or substances that lack the ability to move or react. Antonyms for this expression can include words such as "active," "responsive," "dynamic," or "energetic." These words signify a sense of liveliness, movement, and responsiveness - attributes that are entirely opposite to those of inert objects or substances. As an example, a living organism can be described as active, dynamic, and responsive to its environment, while an inanimate object, such as a rock or a piece of wood, are entirely inert. By focusing on antonyms, we can better appreciate the importance of movement, responsiveness, and activity in our daily lives.