Just a tiny peek in the direction my thoughts are going...
I went to dictionary.com and looked up inane in the thesaurus. These are the results I got:
Mickey Mouse, absurd, asinine, birdbrained, daft, ditzy, driveling, empty, fatuous, flat, foolish, frivolous, futile, harebrained, idiotic, illogical, imbecilic, innocuous, insipid, jejune, jerky, lamebrained, laughable, meaningless, mindless, nerdy, pointless, puerile, ridiculous, sappy, senseless, silly, trifling, unintelligent, vacant, vacuous, vain, vapid, weak, wishy-washy, worthless
These are great words. There's one or two I hadn't heard before. Good to know.