Thriftiest

adjective

1. Evincing thrift; characterized by economy and good management of property; frugal.
2. Thriving by industry and frugality; prosperous in the acquisition of worldly goods; increasing in wealth

   "a thrifty person"

3. Growing rapidly or vigorously; thriving

   "a thrifty plant"

4. Secured by thrift; well husbanded.
5. Having a pleasant appearance; looking or being in good condition