leptosomatic adjective 1noun 1forms 3 adjective1 •Having a tall, thin body.It's possibly odd that the leptosomatic Mario I., so damaged he can't even grip a stick, much less flail at a moving ball with one, is the one kid at E.T.A. whose company Schtitt seeks out […] — 1996 noun1 •A person having this body type; a leptosome. formsleptosomatics · more leptosomatic · most leptosomatic