mieszczcym
Mieszczcym is not a standard Polish word. In reliable dictionaries it does not appear as a correct form. It is most likely a misspelling or a nonstandard inflected form of related terms such as mieszczański, mieszczański, or mieszczaństwo, which derive from mieszczań- (urban bourgeois) or mieszczanin (townsman). The proper instrumental singular of mieszczański is mieszczańskim, not mieszczcym.
Etymology and related terms: The root comes from mieście, meaning city, and the noun mieszczaństwo denotes the
Historical context: In the Polish-Lithuanian Commonwealth and later periods, mieszczaństwo referred to the urban merchant and
Usage notes: If encountered in text, mieszczcym is generally considered a spelling error or a nonstandard form.
See also: mieszczaństwo, mieszczański, mieszczańin, mieszczanin, burgher.