Inattention (noun)

1. A lack of attention or focus.
2. A failure to pay attention or be attentive.
3. A lack of concern or interest.

Origin:

From in- 'not' + attention.

Examples:

1. The inattention of the driver was a major cause of the accident.
2. The inattention of the students was noticed by the teacher.
3. The inattention of the government was criticized for its neglect of the crisis.
4. The inattention of the public was seen as a lack of concern.
5. The inattention of the athlete resulted in a poor performance.