hlýjastur

hlýjastur is the superlative form of the Icelandic adjective hlýr, meaning "warm". As a superlative, hlýjastur indicates the highest degree of warmth. It is used to describe something that is warmer than all other comparable things in a given context. For example, "hlýjastur dagur" would refer to the warmest day. The word can be declined to agree in gender, number, and case with the noun it modifies, though the masculine nominative singular form is often used as the base. This form is used when referring to a male person or a masculine noun. Feminine and neuter forms exist, as do plural forms, all indicating the extreme degree of warmth. It is a common adjective used in everyday Icelandic conversation and writing to express relative temperature or a feeling of comfort and coziness.