Many people recognize that technology often comes with unintended and undesirable side effects.

The stigma that was once attached to things society deemed unhealthy served the purpose of making them undesirable. With the stigma gone many people see little reason not to do whatever feels good at the moment.

I was always good at math and science and I never realized that that was unusual or somehow undesirable.

Sometime they don't let you know that they know that they don't know everything but the core of the medical approach is that you try to identify pathologies which are subsystems within the human body or the larger system that are having undesirable consequences.

It has long been known for sure that the sight of tasty food makes a hungry man's mouth water also lack of appetite has always been regarded as an undesirable phenomenon from which one might conclude that appetite is essentially linked with the process of digestion.

Experience - the wisdom that enables us to recognise in an undesirable old acquaintance the folly that we have already embraced.