Mottainai is a Japanese term meaning "a sense of regret concerning waste when the intrinsic value of an object or resource is not properly utilized".The expression "Mottainai!" can be uttered alone as an exclamation when something useful, such as food or time, is wasted, meaning roughly "Oh, what a waste!" In addition to its primary sense of "wasteful", the word is also used to mean "impious; irreverent" or "more than one deserves".
Usage in Japanese
Mottainai in Japanese refers to far more than just physical waste (resources) as in other cultures. It can refer to wasted and wasteful efforts and actions, activities, time, souls, talents, emotion, minds, dreams, and potential. It is even used to refer to thought patterns that give rise to wasteful action. Mottainai activities commonly lead to anger or protest when the person who is observing the utter waste is incapable of holding back their emotions. Those who do not dwell on the negative and are resigned to move on are more capable of sadly regretting.
Grammatically, it can be used in Japanese as an exclamation ("mottainai!") or as an adjective phrase ("it feels mottainai"). There is no plural form. The collection of mottainai things could be called mottainai koto (もったいない事).
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I have a love of items that are patched and mended. While living in Nothern Japan, I fell in love with Japanese Boro.

This has ideas forming and is something that I want to explore creatively.
Using what I already have, repurposing, and creating are all things that I love.
Mottainai.