This is the 7963rd most frequent Polish word.
mądre
"Wise" or "smart."
Mądra is used here as an adjective describing a 'decision.' It conveys wisdom or sensibility.
To była mądra decyzja, aby przeczytać tę książkę.
It was a wise decision to read that book.
Mądra is used here as an adjective qualifying the 'girl,' implying intellectual capacity or cleverness.
Dziewczyna, która rozwiązała tę trudną zagadkę, była naprawdę mądra.
The girl who solved that difficult puzzle was truly smart.
Mądre is an adjective here that describes 'radies' (advice), highlighting their usefulness and thoughtfulness.