Netâyicü l-A mâl ve Menâhicü l-Ebrâr, whose their authors and interpretators are still unknown, belongs to Classical Ottoman Turkish era and have significant importance in terms of showing the progression of labial harmony process.This article aims to contribute to the studies on this field by focusing on labial harmony in Netâyicü l-A mâl ve Menâhicü l-Ebrâr. Liabial harmony is not a dominant feature over the words of Turkish in its every era and range. It has progressed historically in Western Turkish. In Old Anatolian Turkish the general tendency would be towards labiazation. Even though some examples that abide with harmony rule could be seen from end of Old Anatolian Turkish, labial harmony process in Western Turkish had commenced in early decades of Classical Ottoman Turkish and was completed at the end of the same period. In Netâyicü l- A mâl ve Menâhicü l-Ebrâr along with words that bear examples for laible harmony process, there are also contrary examples to this process. The examples in the text that are contrary to labial harmony had generated a new inharmoniousness. Some new samples of inharmoniousness, that in some cases, depend on plainness or labialization which might be called reverse inharmoniousness . In this article word bases and affixes consist of close rounded and close unrounded vowels which were found in the text have been studied.