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@freakazoid @ashphy @molety @codewiz Yeah, it seems true! I also googled it just now. And I found this article.

http://kanjibunka.com/kanji-faq/old-faq/q0374/

According to this, It seems that originally it was "素的". And word play became popular during that time. For example, "ぜいたくは素敵だ" has two different meanings. "Luxury is wonderful" and "Luxury is a enemy of 素". 素 means normal or simple or not luxury...