one who utters platitudes
• (n.) One addicted to uttering platitudes, or stale and insipid truisms.
Plat`i·tu`di·na'ri·an noun One addicted to uttering platitudes, or stale and insipid truisms. 'A political platitudinarian .' G. Eliot. 
[n] - a bore who makes excessive use of platitudes
platitudinarian, platitudinarianism Someone who is characterized by platitudes; addicted to the use of platitudes.
noun a bore who makes excessive use of platitudes