Adiaphanousness is a somewhat obscure word that refers to the quality of being transparent or sheer, allowing light to pass through. Synonyms for this word include diaphanousness, translucency, and transparency. Other related words that convey the same sense of lightness and delicacy include ethereality, airiness, and weightlessness. Some other synonyms that describe the quality of being transparent or clear include clarity, lucidity, and limpidity. These words can be used to describe a variety of objects, from fabrics to liquids to glass, that allow light to shine through and create a sense of openness and lightness.