Having an abnormally curved or hunched back(adjective)
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Use "hunchbacked" in a sentence
"He's doing some kind of hunchbacked moonwalk or Robot maneuver."
"Those were their cards and they had to play them, willy-nilly, hunchbacked or straight backed, crippled or clean-limbed, addle-pated or clear - headed."
"The third general--an old, hunchbacked man dressed in rags, with a scraggily beard and wild left eye--stepped forward."