This is the 17398th most frequent Polish word.
zaradnością
"Zaradnością" means resourcefulness or the ability to solve problems effectively.
The word 'zaradnością' is used here as an instrumental case noun, emphasizing the quality of being resourceful as a means of action.
Zaradnością pokazywała, jak radzi sobie w trudnych sytuacjach.
With ingenuity, she showed how she handles difficult situations.
Here, 'zaradnością' is used in the instrumental case to highlight the attribute of resourcefulness as something observable and admirable.
Jego zaradnością wszyscy byli pod wrażeniem.
Everyone was impressed by his ingenuity.
In this sentence, 'zaradności' is in the dative case, attributing success to the quality of resourcefulness.