Adumbrate means to sketch or outline something in a hazy or vague way. Antonyms for the word "most adumbrated" include explicit, clear, defined, distinct, specific, precise, and unambiguous. When something is explicit, it is clear and direct, leaving no room for misinterpretation. Defined and distinct refer to things that are well-defined and easy to distinguish from others. Specific and precise mean that something is tightly defined, leaving no room for interpretation. Unambiguous means that something is free from any ambiguity or doubt. Choosing an antonym for adumbrate depends on the context in which it is used but is likely to involve clarity, precision, and definitiveness.