Adjective
1. harmless
2. innocent, innocuous, inoffensive, unoffending, benign, benignant, innocuous, nontoxic, atoxic, painless, safe, innocuous
3. innoxious, inoffensive, uncontroversial, insipid, nontoxic
4. atoxic, innocuous
5. safe, nonmalignant
5. benign, benignant