Other forms: spindliest
Use the adjective spindly for people or objects that are thin and lanky. A newborn foal looks so vulnerable, with its spindly legs, but it's almost immediately able to stand up and walk.
A spindle is a slim wooden rod used to spin wool, and spindly essentially means "like a spindle." You can use it to describe a skinny person's long, thin limbs, like a young ballerina's spindly arms or the spindly legs of an elementary school basketball team. Spindly objects tend to be fragile, too: "These spindly antique chairs make me nervous — I'll sit on the couch."