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Refusing to buy superfluous items at the store will help you save money because you don’t need this items either because they are unnecessary or because you already have more than enough of the items!

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If someone has a reckless lack of care I would say they are heedless, like if they quickly turn out of a subdivision without looking, they would be heedless.

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No one would enjoy being around a faultfinder because they are so negative and habitually complain and find things that are wrong with everything, they’re so annoying.