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.