Here's why:
* Not a synonym: While "lanky" implies a certain degree of thinness, it's not interchangeable with words like "thin," "skinny," or "slim." These words describe general body shape, while "lanky" specifically implies long limbs and a lean physique.
* Not an antonym: It's not the direct opposite of a word like "stout" or "chubby," which describe a rounder, fuller body shape.
Instead, "lanky" is a descriptor with a specific meaning. It's more of a characteristic rather than a synonym or antonym.