IRRELAPSABLE

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