harmful, noxious

harmless, trivial, inconsequential, unobjectionable, inoffensive, incongruous, odd, banal, unremarkable, silly, mundane, benign, comical, obscure, amusing, clumsy, uncontroversial, nonsensical, inadvertent, inconspicuous, bizarre, insignificant, unsavory, injudicious, incidental, insipid, straightforward, unintentional, pointless, inelegant, awkward, indecorous, risible, unseemly, unimportant, ironic, unrelated, strange, noncontroversial, insubstantial, oxymoronic, ungainly, unmemorable, flippant, disconcerting, unexceptional, obtuse, infelicitous, schoolboyish, vague, inapt, amateurish, trite, perfunctory, undramatic, tangential, tasteless, annoying, laughable, nebulous, simple, idiotic, irritating, undiplomatic, unthreatening, distasteful, indiscreet, unappetizing, daft, unsubtle, lighthearted, embarrassing, unappetising, ungraceful, unconvincing, ludicrous, indelicate, preposterous, impolitic, lame, offhand, prosaic, audacious, humorous, superfluous, meaningless, irksome, cheeky, implausible, forgivable, irrelevant, non sequitur, unusual, humerous, ambiguous, nonchalant, coincidental, jokey, minor, absurd, nondescript, fortuitous, commonplace, harmful, newsworthy, incriminating, mystifying, objectionable, provoking, puzzling, similar, similiar, uninteresting, demeaning

placebo

harmless, innocent, innoxious, inoffensive, insipid, safe, uncontroversial, unobjectionable