lekkiego
Lekkiego is the genitive singular form of the Polish adjective lekki, which denotes lightness in various senses such as not heavy, low in intensity, or gentle. In Polish, adjectives agree with the noun they modify in gender, number and case; lekkiego appears when the noun is masculine or neuter and in the genitive singular.
Grammatically, lekkiego is used with masculine or neuter nouns in the genitive singular. For feminine nouns
Common usage examples include phrases such as broń lekkiego kalibru (a weapon of light/caliber) and waga lekkiego
In summary, lekkiego functions as the genitive singular form of lekki, reflecting Polish grammar where adjectives