Dear hev: I just made up a word that might do: "Platitudinarian"

P.S. I retract claim of invention. My dictionary doesn't have it, but American Heritage online does.


SYLLABICATION:
plat·i·tu·di·nar·i·an
PRONUNCIATION:
plt-tdn-âr-n, -tyd-
NOUN:
One who habitually uses platitudes.
ETYMOLOGY:
platitudin(ous) + –arian.

Thereby documenting my modesty in claiming a remarkable command of the obvious.