UNTHRIFTFULLY

\ʌnθɹˈɪftfəlɪ], \ʌnθɹˈɪftfəlɪ], \ʌ_n_θ_ɹ_ˈɪ_f_t_f_ə_l_ɪ]\
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2010 - New Age Dictionary Database
By Oddity Software
 
1913 - Webster's Revised Unabridged Dictionary
By Noah Webster.