Forums Scripts & Popups How do you do `isnotin?` or `! isin`?

Hi. I can do:

if (%somevar isin %listvar)

but how do you do a `isnotin` instead of isin? None of these worked:

if !(..)
if ! (..)
if (.. !isin ..)
if (.. ! isin ..)

Thanks in advance for the help!