The Collaborative International Dictionary
Unthriftily
Unthriftily \Un*thrift"i*ly\, adv.
Not thriftily.
Improperly; unbecomingly. [Obs.]
--Chaucer.
Wiktionary
unthriftily
adv. 1 In a way that is not thrifty. 2 (context obsolete English) In an improper or unbecoming manner.
Usage examples of "unthriftily".
Philosophers are absurd from many causes, but principally from laying out unthriftily their distinctions.