彼は気弱な性格で、人に頼まれると断れない。
He's timid by nature and can't say no when someone asks him for something.
病気が長引いて、父もすっかり気弱になった。
With his illness dragging on, my father has lost all his spirit.
そんな気弱なことを言わずに、最後まで頑張ろう。
Don't talk so faint-heartedly. Let's see it through to the end.