Meaning of 内剛 in Japanese

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Definition of 内剛

ないごう(naigou) 【内剛】

がいじゅうないごう(gaijuunaigou) 【外柔内剛】

(n) gentle but firm
見た目には優しそうだけど、彼って皆から外柔内剛の結構なタフネゴシエータと言われているよ。
He seems like a softy on the surface. But at the core he's got an iron will that makes him an extremely tough negotiator.

ないごうがいじゅう(naigougaijuu) 【内剛外柔】

(n) gentle on the outside but tough on the inside; an iron hand in a velvet glove