「苦しい」(くるしい) refers to a state of suffering, either physically (like a painful wound or difficulty breathing) or mentally (like a difficult situation or financial hardship). It conveys a sense of distress, struggle, or hardship that causes discomfort. Example: 走るのは苦しいけど、頑張ります。 (Running is painful, but I'll do my best.)

肉体的または精神的に苦痛や困難を感じる状態。