Questions & Answers about Liturinn á húsinu er gulur.
Adjectives in predicative position (i.e. after er) take the strong declension and agree in gender, number, and case with the noun they describe. Here the subject liturinn is masculine nominative singular, so the strong nominative masculine ending -ur gives gulur.
- gult would be neuter nominative singular.
- guli is the weak form used when an adjective is attributive to a definite noun (e.g. guli liturinn).