As we passed a remarkably decorated restaurant by car, a friend of mine called 'Astonishingly!' <br/><br/>I would have used 'Astonishing!' instead to indicate my surprise (like "what an astonishing decoration'). <br/><br/>Can somebody please tell me, what is really correct in this case of exclamation: <br/>the adverb astonishingly or adjective astonishing ? <br/><br/>