unthrifty

adjective
un·​thrifty | \ ˌən-ˈthrif-tē How to pronounce unthrifty (audio) \
unthriftier; unthriftiest

Definition of unthrifty

: not thrifty: such as
a : not growing vigorously : not strong or healthy … many an unthrifty malnourished animal was sent out to plow …— Maxine Kumin
b : tending to spend money wastefully unthrifty teenagers

First Known Use of unthrifty

14th century, in the meaning defined above

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The first known use of unthrifty was in the 14th century

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