adjective (a)

• not causing anger or annoyance(adj.all)

  Example:
  Inoffensive behavior.
  

  Synonym:
  unoffending
  

  source: wordnet30
• giving no offense(adj.all)

  Example:
  A quiet inoffensive man.
  A refreshing inoffensive stimulant.
  

  Antonym:
  offensive
  

  source: wordnet30
• substituting a mild term for a harsher or distasteful one(adj.all)

  Synonym:
  euphemistic
  Antonym:
  dysphemistic, offensive
  

  source: wordnet30
• Giving no offense, or provocation; causing no uneasiness, annoyance, or disturbance; as, an inoffensive man, answer, appearance.(adjective)

  source: webster1913