Webster's Revised Unabridged Dictionary · 1913

Forgetfulness

Forgetfulness , noun

1.
The quality of being forgetful; prononess to let slip from the mind.
2.
Loss of remembrance or recollection; a ceasing to remember; oblivion.
A sweet forgetfulness of human care. — Pope
3.
Failure to bear in mind; careless omission; inattention; as, forgetfulness of duty.