Adverbial Form of Adjectives ~ku And ni (〜く、に)

i-adjectives na-adjectives

〜く に

replace the last kana い with く add に (or replace だ／な with に)

~ku ni

Adverbial Form of Japanese Adjectives

i-Adjectives ~ku (〜く)

i-Adjectives	How to	Adverbial Form
高い	い → く	高く
大きい	い → く	大きく
無い	い → く	無く

Na-Adjectives ni (に)

na-Adjectives	How to	Adverbial Form
簡単(な)	に	簡単に
好き(な)	に	好きに
嫌い(な)	に	嫌いに