ἰσχνότης

ητος, ἡ
A. thinness, leanness, σαρκός Hp. Aër. 21; σώματος Arist. HA 581b26; φύσιος Aret. SA 1.7.
2. of style, spareness, i.e. plainness, ἰ. φράσεως, of Lysias, D.H. Vett.Cens. 5.1; cf. Phld. Rh. 1.165S., Demetr. Eloc. 14.
3. thinness, weakness of pronunciation, opp. πλατειασμός, Quint. 1.5.32.
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
An open-access project