szóstym
Szóstym is the instrumental and locative singular form of the Polish ordinal adjective szósty, meaning the sixth. It is used to express an ordinal position in contexts that require the instrumental or locative case, typically with masculine or neuter nouns. For example, you can find szóstym in phrases such as w szóstym rozdziale (in the sixth chapter) or na szóstym miejscu (in the sixth place).
Morphology and etymology: szósty is derived from the numeral sześć (six) with the customary adjectival suffix
Usage notes: Szóstym is most commonly encountered with masculine or neuter nouns in instrumental or locative
See also: szósty, the base form of the ordinal adjective; related ordinal forms in Polish for other