spontano

1. spontaneously
   Sasvim spontano smo otišli na more. — We went to the seaside completely on the spur of the moment.
   Protest je nastao spontano, niko ga nije organizovao. — The protest arose spontaneously; nobody organised it.
2. (of behaviour) naturally; unaffectedly
   Na snimku se ponašaj spontano, kao da kamere nema. — Act naturally on camera, as if it weren't there.