þykku

þykku is a form of the Icelandic adjective meaning “thick” or “dense.” It is used to describe objects with notable thickness or density and illustrates how Icelandic adjectives inflect for grammatical context. In Icelandic, the form of an adjective can change depending on gender, number, and definiteness, and þykku represents one of the inflected endings that may appear in appropriate constructions. The exact form a speaker uses depends on the noun it modifies.

Etymology and related forms: The Icelandic word is descended from Old Norse and is cognate with the English word thick. This connection reflects a shared Germanic heritage for vocabulary related to solidity, density, and structure across North Germanic languages.

Usage and sense: In contemporary Icelandic, þykku can occur in descriptive prose and technical language about materials, textures, and physical properties. It covers literal thickness as well as metaphorical density or concentration, depending on the context. As with other adjectives, its appearance in a sentence is influenced by the surrounding nouns and determiners, making it one option among several inflected forms to convey the intended meaning of thickness or density.

See also: Icelandic language; Icelandic adjectives; Adjective declension; Thickness (concept).