なおさら
なおさら · naosara · JLPT N1 · adverb
all the more
なお (still, even) + さら (further, once more) = still further: all the more
Used to say one thing is even more true than another, as in 'hard, and all the more so for her', or after a negative, 'can't read it, still less write it'. It is built from なお (still) and さら (further, as in さらに).