niadaniem
Niadaniem is the instrumental singular form of the Polish noun niadanie, a term that refers to a meal associated with breakfast. In contemporary standard Polish, the normal term for the morning meal is śniadanie, and niadanie is generally found only in historical, literary, or regional contexts. As a result, niadaniem is most often encountered in texts aiming to evoke an older or more rustic tone rather than in everyday speech.
Grammatical usage of niadaniem is primarily as a form used in contexts where the noun niadanie is
Notes on form and register: niadaniem is a standard inflected form within Polish grammar, but its appearance
See also: śniadanie, niadanie (historical/dialectal usage), Polish grammar on instrumental forms.