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Re:Redditors earning $100k+ a year, what are your secrets to... by amvp on Thursday February 24, 2011 @10:05PM (#2260870)
To be thrifty, is to be careful with your money. Oddly though, a spendthrift is the opposite. http://www.thefreedictionary.com/spendthrift
Re:Redditors earning $100k+ a year, what are your secrets to... by gjm11 on Friday February 25, 2011 @04:18AM (#2261629)
Here's how the etymology works:

thrive: prosper

thrift (~= having-thrived): prosperity, hence money

thrifty: acting so as to get or maintain thrift, hence not spending much

thrift (derived meaning): the quality that thrifty people have; again, not spending much

spendthrift: a person who spends his or her thrift; hence, someone who spends a lot

spendthrift (derived meaning): the quality that spendthrifts have; that is, spending a lot.