She has gotten two tickets for 'reckless driving'. [=driving a car in a dangerous manner]
He showed a 'reckless disregard for' the safety of others.
They 'recklessly' threw themselves into battle.
(..) So, when did you guys decide to get pregnant? Well, we didn't exactly decide. We were talking about it, and then one night we got a little reckless. Oh, tell us! Yeah, tell us. No, I'm embarrassed. Oh, come on, we're all grown-ups. (..)2016 TvShow: The Big Bang Theory Title: The Positive Negative Reaction Season: 9 Episode 16