unthrifty

adjective, thrift·i·er, thrift·i·est.

1. practicing thrift or economical management; frugal: a thrifty shopper.
2. thriving, prosperous, or successful.
3. thriving physically; growing vigorously.

adjective thriftier or thriftiest

1. showing thrift; economical or frugal
2. rare thriving or prospering

adj.late 14c., from un- (1) “not” + thrifty. adj.late 14c., from thrift + -y (2). Related: Thriftily; thriftiness.