Caliginosity is a noun that refers to something that is dark, obscure, or gloomy. Its antonyms, on the other hand, refer to brightness, clarity, and transparency. Synonyms for brightness include luminosity, radiance, brilliance, and daylight. Clarity can be replaced with straightforwardness, simplicity, and explicitness. Transparency can be substituted with translucency, clearness, and limpidity. It is essential to note that antonyms may vary depending on the context in which they are used. In conclusion, depending on the context, words such as luminosity, straightforwardness, and translucency could be used as antonyms for caliginosity.