Using the relational database of KN morphology inflection of adjectives is investigated: masculine (and non-gender forms) stems, feminine stems and their correlation. The unique and well-established paradigms of inflection types are reviewed. The variation of stems and its causes, the language differences in the individual parts of the KN are dicussed.KEYWORDS: old texts, „Knyga nobažnystės“, adjectives’ inflection, declensional types, inflection stems.DOI: http://dx.doi.org/10.15181/rh.v17i1.1147