The Collaborative International Dictionary of English v.0.48:

Sententious \Sen*ten"tious\, a.[L. sentenciosus: cf. F.
   sentencieux.]
   1. Abounding with sentences, axioms, and maxims; full of
      meaning; terse and energetic in expression; pithy; as, a
      sententious style or discourse; sententious truth.
      [1913 Webster]

            How he apes his sire,
            Ambitiously sententious!              --Addison.
      [1913 Webster]

   2. Comprising or representing sentences; sentential. [Obs.]
      "Sententious marks." --Grew.
      [1913 Webster] -- Sen*ten"tious*ly, adv. --
      Sen*ten"tious*ness, n.
      [1913 Webster]