Superlative adjectives in Slovenian grammar are used to express the highest degree of a quality. They are formed by adding the suffix „-ji“ or „-naj“ to the stem. The stem is the first part of the adjective without the „-en“ ending. For example, the superlative form of „velik“ (big) is „najveliki“ (the biggest). It’s important to note that in Slovenian, the superlative always includes the definite article, producing a translation equivalent to „the most/biggest“ in English.