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Adjective: innocuous  i'nók-yoo-us
  1. Not injurious to physical or mental health
  2. Not causing disapproval
    "it was an innocuous remark"; "confined himself to innocuous generalities";
    - unobjectionable
  3. Lacking intent or capacity to injure
    "an innocuous prank";
    - innocent

See also: harmless, innoxious, inoffensive

Antonym: noxious