incapacious

from The Collaborative International Dictionary of English v.0.48

Incapacious \In`ca*pa"cious\, a. [Pref. in- not + capacious: cf.
   L. incapax incapable.]
   Not capacious; narrow; small; weak or foolish; as, an
   incapacious soul. --Bp. Burnet. -- {In`ca*pa"cious*ness}, n.
   [1913 Webster]