forgetfulness (part of speech: noun)
thoughtlessness (part of speech: noun)
He knew something, or, at least, he guessed at something that was very much a blankness
to me at that time.
- "The Ghost Pirates", William Hope Hodgson.
The heavy blankness
of his waiting was broken by the gayest sound in the world.
- "A Man's Hearth", Eleanor M. Ingram.
Max came in always, before he went, and, leaning over the back of a chair, would inform her of the absolute blankness
of life in the hospital without her.
- "K", Mary Roberts Rinehart.