Harðri
Harðri is a feminine singular dative form of the Icelandic adjective harður, meaning "hard." In Icelandic grammar, adjectives must agree in gender, number, and case with the noun they modify. The dative case is often used to indicate indirect objects, the object of certain prepositions, or after specific verbs. Therefore, "harðri" would appear in a sentence where a feminine singular noun is in the dative case and is described by the adjective "hard." For example, in the sentence "Ég gaf henni harðri bók" (I gave her a hard book), "bók" (book) is feminine and in the dative case, hence the adjective "harðri." Understanding the inflectional system of Icelandic is crucial for correctly using such forms. The root meaning of "hard" can extend to abstract concepts such as difficult, tough, or severe, and "harðri" would convey these meanings when modifying a feminine singular dative noun.