INDECLINABLY

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