Stooped describes a body — usually a back or shoulders — that is permanently bent forwards and down, so the person no longer stands straight. It is most often said of old people, whose spines have curved with age, and of people whose work has bent them: farmers, miners, tailors. That is the key thing about this word: it means a lasting shape, not a movement. If you bend down once to pick up a pen, you stoop (the verb), but you are not stooped. It goes naturally with a small set of nouns — 'a stooped old man', 'stooped shoulders', 'his stooped figure' — and after be or become: 'he has become stooped in the last few years'. The feeling it carries is usually gentle sadness, a sign of age, tiredness or a hard life, and it is often paired in description with details like thin hands or slow steps. You may also meet 'stooping' used the same way, and 'stoop-shouldered' in American writing. Note that the verb stoop has a second, separate meaning — to lower yourself morally, as in 'I wouldn't stoop to lying' — but the adjective stooped only ever describes the body.