Innocent

I'm tired of the word innocent. What does it mean? "Are you really as innocent as you look?" "I refuse to believe anyone can be that innocent." "Nahi yar, you have a very innocent smile." The exact definition according to Dictionary.com:

in·no·cent
[in-uh-suhnt]
- adjective
1. without sin; pure
2. not guilty
3. not involving evil intent
4. not causing injury; harmless
5. devoid (usually fol. by of)
6. guileless; naive
- noun
7. innocent person
8. young child
9. naive person

So exactly what context are you speaking in? Exactly, how does it apply to me?