This is the 11210th most frequent Polish word.
grubości
"Grubości" means "thickness" in English.
Here, 'grubość' is used to indicate the adequate property of the wall, namely its thickness, as it relates to sound insulation capabilities.
Ściana ma grubość wystarczającą, żeby izolować hałas.
The wall has enough thickness to insulate noise.
Here, 'grubość' is used to describe the measurement of thickness of a physical object, the book.
Książka ma grubość dwóch centymetrów.
The book has a thickness of two centimeters.
In this sentence, 'grubość' refers to the specified measurement of thickness for a material, emphasizing the dimensional requirement.