Adverb (fukushi)
still more; even more; all the more
Usually written using kana alone
それらの星は肉眼で見える、まして望遠鏡ならなおさらである。You can see the stars with your naked eye, and even better through a telescope. still less; even less
Usually written using kana alonewith neg. verb
Also written 猶更【なおさら】