Innocent (adjective)

1. Not guilty of a crime or offense.
2. Not having or showing knowledge of evil; morally pure.
3. Lacking knowledge or experience; naive.

Origin:

From old french innocent, from latin innocentem ("harmless, not guilt.y")

Examples:

1. He was found innocent of the charges against him.
2. The child's innocent face made it hard to believe he had done anything wrong.
3. She was innocent of the ways of the world and easily taken advantage of.
4. The company's advertising was found to be innocent of any deception.
5. He had an innocent smile that everyone found endearing.