Unless said partner is ready to be whacked over their head with the box for their thoughtlessness, they have made a grave mistake.
Nothing seemed to matter except to show my knight that after all my selfishness and thoughtlessness and conceit I had freed him.
She blamed herself for her thoughtlessness, and resolved that it should not be so in future.
For me there was no more freedom, no more of hilarity, of thoughtlessness, or of youth.
However, he now experienced sudden remorse for his thoughtlessness.
With all his thoughtlessness, Tom was quick to see and feel these things, and was not spoilt enough yet to laugh at them.
Earnestness is the path of immortality (Nirvana), thoughtlessness the path of death.
The growth of comfort among the rulers meant the growth of thoughtlessness.
What a thoughtlessness to press on Russia the convention of Paris?
It was Harriet, after all, upon whom the punishment for her mother's thoughtlessness fell.