Adjective : unmindful of obligations.    From Dictionary.com. 

Neither love nor money will bring another "body" - house to us when this decays; when poisons or parasites infest it as the result of a pernicious diathesis, of debasing, destructive tendencies; in short, of unmindfulness!.    From Wordnik.com.  [Intestinal Ills Chronic Constipation, Indigestion, Autogenetic Poisons, Diarrhea, Piles, Etc. Also Auto-Infection, Auto-Intoxication, Anemia, Emaciation, Etc. Due to Proctitis and Colitis] Reference

Neither was Pompey guilty in this of ingratitude or unmindfulness of what had occurred in Sicily, which some have laid to his charge, but was guided by a high minded policy and a deliberate counsel for the security of his country.    From Wordnik.com.  [The Lives of the Noble Grecians and Romans] Reference

And although technology has made our lives easier and entertainment cheaper, Anderson writes, pure, unadulterated, distraction-free thinking has become a luxury; what we really need, he argues, is time to think: "This sort of free-associative wandering is essential to the creative process; one moment of judicious unmindfulness can inspire thousands of hours of mindfulness.".    From Wordnik.com.  [Andrea Chalupa: A mindful proposal: Can you handle 24 hours of solitude?] Reference

There has always been about him a beautiful unmindfulness of himself while engaged in his life-work.    From Wordnik.com.  [Life of Charles T. Walker, D.D., ("The Black Spurgeon.") Pastor Mt. Olivet Baptist Church, New York City] Reference

Indeed, they meant to be very kind and forbearing, and praised and petted her till she was ready to forget her weariness, as well as their unmindfulness of it.    From Wordnik.com.  [Christie Redfern's Troubles] Reference

"This sort of free-associative wandering is essential to the creative process; one moment of judicious unmindfulness can inspire thousands of hours of mindfulness.".    From Wordnik.com.  [Original Signal - Transmitting Buzz] Reference

I had bad minutes: it needed all the tact and graciousness whereof I was master to smooth over some apparent lapses of memory and unmindfulness of old acquaintances of which I was guilty.    From Wordnik.com.  [The Prisoner of Zenda: being the history of three months in the life of an English gentleman] Reference

An accident is an unexpected and unfortunate event that occurred as a result of a series of unforeseen negligence, lack of care and keenness to details and unmindfulness to consequences of actions.    From Wordnik.com.  [We Blog A Lot] Reference

In the Vision of Er the souls passed straight forward under the throne of necessity, and out into the plains of forgetfulness, where they must severally drink of the river of unmindfulness whose waters cannot be held in any vessel.    From Wordnik.com.  [The Roadmender] Reference

This habit is by now so ingrained that I have to be careful it doesn’t slip into automatic unmindfulness.    From Wordnik.com.  [Thanks Giving and Getting] Reference