The purpose of this study is the systematic description of a set of data called 'adjectives' in Korean, which reduces to a minimum theoretical preoccupations and abstract formalizations with no practical applications. The framework of the research is the 'Lexicon-grammar', whose fundamental idea is that the minimal meaningful unit is the simple sentence and not an isolated word. This work is constituted as follows: given that the corpus extracted from current dictionaries is insufficient for the purpose, a complete corpus will be reconstituted: first, with a formal definition, and then according to some other principles discussed in the first section. With this more complete corpus (5300 items), general syntactic properties of adjectival constructions will be examined in the second section. The third section is devoted to the description of 15 classes of adjectival structures. These syntactic classes will be represented in the form of tables in the annex. The results obtained in this work are indispensable at least for the following activities: first, the elaboration or verification of a linguistic theory demands a priori examination and systematic description of empirical data; furthermore, a syntactic description of lexical data, which is as exhaustive as possible, has a particular interest in the perspective of the elaboration of a lexicon suitable for computer processing of natural language.