The Collaborative International Dictionary of English v.0.48:

Concinnous \Con*cin"nous\, a. [L. concinnus.]
   Characterized by concinnity; neat; elegant. [R.]
   [1913 Webster]

         The most concinnous and most rotund of proffessors, M.
         Heyne.                                   --De Quiency.
   [1913 Webster]