The fact of not using; abandonment or neglect of use; failure to use.(noun)
The Century Dictionary (Public Domain)
Use "non-use" in a sentence
"The non-use argument on the part of the Fund seems to suggest that the general public isn't getting bang for its buck, and I would tend to agree that the current very limited uses of the park which restrict access to the park don't serve the general public well enough."
"But she also supports her explanation of nuclear non-use by citing an important study of the period by the nuclear historian and analyst George Quester."
"Tannewald covers three possible factors that might explain non-use."