loose-jointed

adjective

loose-joint·​ed ˈlüs-ˈjȯin-təd 

1

: having joints apparently not closely articulated

2

: characterized by unusually free movements

loose-jointedness noun

Word History

First Known Use

1859, in the meaning defined at sense 2

Kids Definition

loose-jointed

adjective

loose-joint·​ed

ˈlüs-ˈjȯint-əd

1

: having flexible joints

2

: moving with unusual freedom or ease

Medical Definition

loose-jointed

adjective

loose-joint·​ed ˈlüs-ˈjȯin-təd 

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-jointedness noun

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