even more; further; all the more
Emphasizes an increase in degree or intensity beyond what is already present. Often used in formal or written contexts.
After hearing his explanation, I became even more confused.
努力を続ければ、なお一層の成果が期待できる。
If you keep making efforts, you can expect even greater results.
さらに is a common adverb for 'furthermore' or 'even more', while なお一層 is more emphatic and slightly more formal.
Standard kanji-kana mixed spelling; the most common written form.
Kanji spelling using 尚 for なお; less common but still encountered.
Compound of なお (still, yet) and 一層 (more, further), reinforcing the idea of an additional increase.