This is the 1825th most frequent Japanese word.
弱
"Weak."
In this sentence, 『弱い』 refers to lacking skill or proficiency in soccer.
彼はサッカーが弱いです。
He is weak at soccer.
Here, 『弱い』 is used to describe the fragility or lack of strength in the bridge's structure.
この橋は構造が弱いです。
This bridge has a weak structure.
In this context, 『弱い』 means being susceptible or vulnerable, specifically to cold temperatures.