sententious

adjective
  1. given to moralizing in a pompous or affected manner.
    “He tried to encourage his men with sententious rhetoric, but to no effect: ultimately they were just a bunch of uninspired, myopic dickheads.”

garrulous

adjective
  1. excessively talkative, especially on trivial matters.
    “He was nothing but a foolish, garrulous old man who needed to be silenced.  Now he is silent.”