Similar word to in-nocuous:

banal, blah, bland, blind, boring, colorless, dead, dim, drab, draggy, flavorless, ho hum, inane, innocuous, insipid, jejune, lead balloon, lifeless, matte, monotonous, muted, pointless, prosaic, prosy, sapless, spiritless, stale, tasteless, tedious, uninteresting, unpala