This is the 17547th most frequent Polish word.
zbrodnią
"Zbrodnią" means "a crime" or "a serious crime" in English.
Here, 'zbrodnią' (a crime) is used in the instrumental case, indicating the means or relation to the action of committing.
Popełnienie zbrodnią jest surowo karane.
Committing a crime is severely punished.
In this sentence, 'zbrodnią' is used metaphorically to express a moral or significant wrong.
Uważam, że niszczenie książek jest zbrodnią.
I consider destroying books to be a crime.
Here, 'zbrodnią' is used in the ablative form to refer to a concept or condition related to crimes in a general context.