Inefficacy (noun)

The quality or state of being ineffective or powerless to produce a desired effect.

Origin:

Derived from the latin word 'inefficax' meaning ineffective or powerless.

Examples:

1. The inefficacy of the medicine was due to a lack of proper dosage.
2. The inefficacy of the new policy was noted by experts in the field.
3. The inefficacy of the team's efforts was evident in their lack of progress.
4. The inefficacy of the plan was clear to everyone involved, leading to its eventual failure.
5. The inefficacy of the procedure was a major concern for the patient and their family.