The word "adumbrations" refers to vague or incomplete outlines of something. Its antonyms would be clear or precise representations. Some examples of antonyms for "adumbrations" include explicitness, clarity, specificity, certainty, transparency, and distinctness. Adumbrations may also suggest an element of shadow or darkness, so antonyms could include luminosity or brightness. The opposite of adumbration could also be an elaboration or a detailed explanation. In summary, antonyms of "adumbrations" could include specificity, clarity, brightness, and elaboration, among others.