You might think so but nu actually means now in several European languages. .nu happens to be the third most popular extension in Sweden after .se and .com
Is "sold" a word in Sweden - or is English spoken that often in Sweden (it sounds like you bought this domain with that target audience in mind?).
IMO mixing languages with other ccTLDs is not a good idea. I see people registering domains like HomeOwnersInsurance.de and just have to wonder what were they thinking? Not many English speaking people would type that and I don't think many Germans would either.
Another question is - what would you use it for in development? Someone selling something that they want to sell quickly (sold now?)?
I'd hate to say it but this one, even with development, is going to be a hard one to get off the ground without some serious investments (time and money) up front and still may not pay out well. I hope you didn't pay a lot of the domain (but we all make that mistake).
I didn't even know that ccTLD existed - it's for a very small island in the south Pacific (British colony, maybe?) with fewer than 1500 people on it. Luckily, English is one of their official languages (along with a tribal / indigenous language).