That's a bit of a trick question! Metals are known for their excellent conductivity, both of heat and electricity.

There are no metals that are completely non-conductive. However, some metals are less conductive than others:

* Mercury is a liquid metal with relatively low conductivity.

* Lead is another metal with relatively low conductivity.

It's important to note that even these metals conduct electricity, just not as well as copper, silver, or gold.