Unthriftily
Pronunciation : Un*thrift"i*ly
Part of Speech : adv.
Definition : 1. Not thriftily.
2. Improperly; unbecomingly. [Obs.] Chaucer.
Source : Webster's Unabridged Dictionary, 1913
Merriam-Webster's Everyday Language Reference Set: Includes: The Merriam-Webster Dictionary, The Merriam-Webster Thesaurus, and The Merriam-Webster Vocabulary Builder