This is the 10248th most frequent Polish word.
błękitno
Sky blue.
Describes the color of the sky using 'błękitno' in an adverbial capacity.
Niebo było błękitno i bezchmurne.
The sky was blue and cloudless.
Indicates a compound color description in a compound adjective form.
Widziałam piękny błękitno-biały obraz zimy.
I saw a beautiful blue-white picture of winter.
Uses 'błękitno' metaphorically in emotional description.