bezazleno

1. innocently; naively
   Dete se bezazleno nasmejalo. — The child smiled innocently.
   Pitala je sasvim bezazleno, bez ikakve namere. — She asked quite innocently, with no ulterior motive.
2. (of actions, impressions) harmlessly; harmless
   Ta bolest u početku izgleda bezazleno. — At first this illness seems harmless.

With izgledati, delovati, zvučati it translates as an adjective: izgleda bezazleno — "looks harmless", zvuči bezazleno — "sounds harmless".