UNDEFEASIBLE

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