Source : WordNet®

unoffending
     adj 1: not offending; "an unoffending motorist should not have been
            stopped" [ant: {offending}]
     2: not causing anger or annoyance; "inoffensive behavior" [syn:
         {inoffensive}] [ant: {offensive}]
     3: causing no harm; "an inoffensive animal" [syn: {inoffensive}]