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This study aims to reveal a principle in the changing pattern of the uninflected word, which phenomenon is prevalent in the Middle Korean. To achieve this goal, this article focuses on the nonautomatic change found in the stem of the uninflected word such as namu (나무). In previous studies, some scholars attempted to explain the reason, they failed to give an explanation of the principle behind the phenomenon that raises a question regarding the function of verb and noun. Also, the theoretical explanation of the usage of uninflected word, which has been obscure, and it does not allow readers to clearly understand it. This article therefore focuses on the independent nature and function of the uninflected word in Middle Korean. In my analysis of the uninflected word, I suggest separating the part of the uninflected word into two variants which cause nonautomatic changes of the uninflected word. In this study, both the historical data and dialects of Modern Korean language are employed to prove this point. In addition, I propose that ‘-(eu(으))X-’ ending may have been a key to understand the phenomenon.