nag

1. naked; nude
   Na slici je naga žena na plaži. — The painting shows a nude woman on a beach.
   Beba je spavala naga pod ćebetom. — The baby was sleeping naked under the blanket.
2. (of truth, facts) naked; bare
   To je naga istina, sviđalo se to tebi ili ne. — That's the naked truth, whether you like it or not.

In everyday speech go (gola, golo) is more common; nag sounds more literary.