So what do [states with no real concept of IFR outside controlled airspace] call it when you're flying in cloud outside controlled airspace?
Careless and reckless.
Seriously, they tend to have an infrastructure of controlled aispace, usually class E, that makes it highly impractical to fly IFR outside controlled airspace. In particular I'm thinking of Germany, where IFR outside controlled airspace is actually illegal, and the USA where, with a few exceptions, controlled airspace starts at 1200 ft agl (or lower).