undependable

That was the foolishness of my vision for my life—that my backup career would be completely undependable.

Its very method of control makes it an undependable force, and at times unavailable.

Brandy, alas, always made him quarrelsome and undependable of mood.

The thing grew increasingly mystifying; increasingly unorthodox and undependable, too.

Can you think of any reason why someone might think this is an undependable type of ammunition?

Are you ignorant of how uncontrolled and undependable the average human being is in all the affairs of sex life?