外柔内剛 がいじゅうないごう Meanings Noun gentle but firm Kanji 外 outside. Read as ガイ. 柔 soft. Read as ジュウ. 内 inside. Read as ナイ. 剛 sturdy. Read as ゴウ. Word lists Yojijukugo (四字熟語) Jinuma: Japanese Dictionary · Word lists