1) Asthenic 2) Lean 3) Thin 1) Lean 2) Slim 
Relating to, or having the characteristics of, an ectomorph. ... (05 Mar 2000) ... 
Type: Term Pronunciation: ek′tō-mōrf′ik Definitions: 1. Relating to, or having the characteristics of, an ectomorph.
[adj] - having a lightly-muscled build with long limbs
ectomorph, ectomorphic 1. An individual having a lean, slightly muscular body shape in which tissues derived from the embryonic ectoderm predominate. 2. A person with a thin non-muscular body. 3. Someone who belongs to a physiological type that has long lean limbs. 4. A constitutional body type or build (biotype or somatotype) in which tissues o...
adjective having a build with little fat or muscle but with long limbs