æðstu
æðstu is an Icelandic adjective form meaning the highest or greatest. It functions as the superlative of the adjective æðstur and is used to describe something that occupies the top position in rank, degree, size, or intensity. In modern usage, æðstu appears before a noun and agrees with it in number and case, commonly referring to the foremost or most eminent in a given context.
In practice, æðstu is found in formal, historical, or descriptive prose when expressing extremity or supremacy.
Origin and related forms: æðstu derives from the base adjective æðstur, with the semantic field of eminence