Shibui: “... summarizes all the best in Japanese life, yet it has no explanation and cannot be translated... the best approximation is... acerbic good taste." --James Michener

Inside Isetan in Shinjuku Tokyo, Patricia answers Jim Reed’s question: 

“What is the difference between Wabi Sabi and Shibui?”

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Let’s start with Shibui (adj)

resource: https://en.wikipedia.org/wiki/Shibui

 Shibumi (noun)

 Shibusha (noun)