originalno

1. in an original way; creatively
   Stan je uređen baš originalno. — The flat is decorated in a really original way.
   Ona se uvek originalno oblači. — She always dresses in an original way.
2. colloq. originally; initially
   Kuća je originalno imala samo jedan sprat. — The house originally had only one floor.

For "initially", prvobitno or izvorno is more usual in neutral style.