The Collaborative International Dictionary of English v.0.48:

Bromidic \Bro*mid"ic\, a.
   1. of or pertaining to bromide (definition 2).
      [WordNet 1.5]

   2. conventional or trite; repeated too often; overfamiliar
      through overuse -- of sayings, assertions, or discourses;
      as, bromidic sermons.

   Syn: commonplace, hackneyed, shopworn, threadbare, timeworn,
        tired, trite, well-worn.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

bromidic
    adj 1: given to uttering bromides
    2: dull and tiresome but with pretensions of significance or
       originality; "bromidic sermons" [syn: bromidic, corny,
       platitudinal, platitudinous]