ないごうがいじゅう 内剛外柔 LinksSentence search for 内剛外柔Sentence search for ないごうがいじゅうKanji details for 内, 剛, 外 and 柔Edit in JMdict Noun1. gentle on the outside but tough on the inside; an iron hand in a velvet gloveYojijukugo (four character compound) Discussions Log in to talk about this word.