The term "most diagrammatic" refers to something that is highly detailed and graphical, but what are its antonyms? Antonyms for "most diagrammatic" include words like vague, imprecise, hazy, unclear, and ambiguous. These words describe things that lack detail or definition, and are not presented in a clearly organized or graphical way. For example, a vague description of a process would be the opposite of a detailed and diagrammatic explanation. Similarly, an imprecise drawing would be the opposite of a highly detailed and diagrammatic sketch. Therefore, when something is not described well, it can be described as the antonym of "most diagrammatic.