Pietra Dura — the opposite of Naff!
Look in any dictionary for the meaning of the word ‘Naff’ and you’re likely to come up with some or all of the following terms: ‘tacky’, ‘tasteless’, ‘cheap’, ‘duff’, ‘inferior’ or just downright ‘bad’. The antonyms to be found include words like, first-rate, high-quality, exceptional, first-class, superior, fine and excellent. I can tell you all this because I had gone online to find out if there was a definitive word that was the etymological opposite