Reckless is not inadvertent; it's not by mistake or because you weren't paying attention. Recklessness is a subjective mental element in the criminal law, and it's where someone recognizes a substantial risk and proceeds anyway. For example, if someone finds a picture of their classmate online and they know this person to be a virtuous person and they've known them for many years and they know they probably would never have consented to the posting or distribution of this image, but they decided to re-post it anyway or to sent it to friends, that's recklessness, where there's a substantial risk of knowledge, but the person decides to proceed anyway.
On May 1st, 2014. See this statement in context.