一層 いっそう
issō

Adverb

1. even more; still more; all the more; more than ever

いままで以上 いじょうにいっそう勉強 べんきょう はげみなさい。
imamade ijōni issō benkyōni hageminasai.
You should study even more than before.
Noun

2. one layer

Noun

3. lowest floor (of a building)

Adverb

4. rather; sooner; preferably

Obsolete
Related to いっそ