weak, not good at, weakness, soft spot, weakling
Ela dizia que tinha o coração fraco.
She used to say that she had a weak heart.
— As Diabólicas (1955)
Não achei que você fosse tão fraco, que você ficaria doente.
I didn't think you were so weak that you'd get sick.
— Felizes Juntos (1997)
Tom estava muito fraco.
Tom was very weak.
I'm feeling weak.
O julgamento de Yanni foi fraco.
Yanni's judgment was poor.