INEXSUPERABLE

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