IPA: /ˈkrʊkˌbækt/
KK: /ˈkrʊkˌbækt/
Having a curved or humped back, often due to a spinal condition.
The old man walked slowly, his crookbacked posture making it difficult for him to stand straight.
Crookbacked → It is formed from "crook" (from Old English "crōc", meaning a bend or curve) and "-backed" (meaning having a specified type of back). The word describes someone having a back that is bent or curved.
Think of a 'crook' as something that is 'bent' — that's why 'crookbacked' refers to someone with a bent or curved back.
No commonly confused words.