This is the 1903rd most frequent Polish word.
radosław
"Radosław" is a Polish male given name meaning "one who rejoices in glory" or "glorious joy."
The word 'Radosław' is used here as a proper noun, specifically a personal name.
Radosław jest moim bliskim przyjacielem.
Radosław is my close friend.
In this sentence, 'radosław' is used creatively as a metaphorical term for a joyful expression, though this use is not standard.
Na jego twarzy widać było radosław, oznaczający prawdziwą szczęśliwość.
There was 'radosław' on his face, indicating true happiness.
Here, 'Radosław' is employed to denote a geographic location, used as a proper noun.