Source : Webster's Revised Unabridged Dictionary (1913)

Platitudinous \Plat`i*tu"di*nous\, a.
   Abounding in platitudes; of the nature of platitudes;
   uttering platitudes. -- {Plat`i*tu"di*nous*ness}, n.

Source : WordNet®

platitudinous
     adj : dull and tiresome but with pretensions of significance or
           originality; "bromidic sermons" [syn: {bromidic}, {corny},
            {platitudinal}]