This is the 784th most frequent Japanese word.
強
"Strong" or "strength."
Here, 強い describes '意志' (will), emphasizing its robustness or strength.
彼は強い意志を持っている。
He has a strong will.
In this context, 強い is used to describe the physical durability or strength of the rope.
このロープは非常に強い。
This rope is very strong.
Here, 強 is part of the compound word '強風' (strong wind), referring to the intensity of the wind.