Pronunciation: (as-then'ik), [key]
1. of, pertaining to, or characterized by asthenia; weak.
2. (of a physical type) having a slight build or slender body structure. Cf. athletic (def. 5), pyknic (def. 1).
a person of the asthenic type.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.