Medical Definition of loose–jointed
1: having or marked by one or more joints with an increased range of motion an unstable, loose-jointed shoulder
2: moving or able to move and bend in a free and relaxed way : very flexible a loose-jointed athlete
loose–jointednessnoun Other possible characteristics include leanness, small muscle mass, loose-jointedness, flat feet, a backward curve of the legs at the knees and a narrow mouth and small jaw in a narrow, elongated head.—Jane E. Brody, The New York Times, 16 Oct. 2001
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