What is the abstract noun for cold feet?

There isn't a single, perfect abstract noun for "cold feet." However, depending on the context, several options could work:

If you're referring to the physical sensation:

* Chill

* Coldness

* Frigidity

If you're referring to the feeling of doubt or fear:

* Hesitation

* Indecision

* Apprehension

* Timidity

* Uncertainty

* Fear

If you're referring to the act of backing down:

* Withdrawal

* Retreat

* Reluctance

The best option depends on the specific meaning you're trying to convey.