Gelidness, a term that describes the state of being extremely cold or icy, can be described using a variety of synonyms. One such synonym is frigidity, which is often used to describe severe coldness. Other synonyms include chilliness, frostiness, and arcticness, which all signify a state of intense cold. Alternatively, the term iciness can be used to describe the feeling of being frozen or numb due to the cold. These synonyms are all useful for conveying the same sense of coldness and are a great way to add variety and nuance to descriptions of winter weather or other scenarios where extreme cold is present.