The antonyms for the word "was diffuse" include "was concentrated," "was focused," "was clear," "was precise," and "was direct." When something is "diffuse," it is spread out, scattered, and lacking in definition. Therefore, the opposite of "was diffuse" would be to have something that is condensed, centralized, and clear in its purpose or message. For example, a scientific paper that is "diffuse" might lack a clear hypothesis or have multiple ideas scattered throughout the text, while one that is "focused" would have a clear hypothesis and a specific direction for the research. The use of antonyms helps to clarify meaning and differentiate between different concepts.