srednjim
Srednjim is the instrumental singular form of the adjective srednji in standard South Slavic languages, including Croatian, Bosnian, Serbian, and Montenegrin. The adjective srednji means middle, central, or intermediate. In its instrumental masculine and neuter forms it takes the form srednjim, while the feminine instrumental singular form is srednjom. The form is used when an adjective modifies a masculine or neuter noun in the instrumental case, for example: srednjim dijelom (the middle part), srednjim redom (in the middle row), srednjim slojem (the middle layer). The feminine counterpart appears as srednjom with feminine nouns in the instrumental, e.g., srednjom rukom (with the middle hand). In usage, srednjim is common in descriptive phrases, technical writing, and descriptions of spatial order or quality.
Etymology: derived from the root sred- meaning middle or center, typical of Slavic languages. Variants exist