UNCEREMONIOUS

\ʌnsˌɛɹɪmˈə͡ʊnɪəs], \ʌnsˌɛɹɪmˈə‍ʊnɪəs], \ʌ_n_s_ˌɛ_ɹ_ɪ_m_ˈəʊ_n_ɪ__ə_s]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd
 
1908 - Chambers's Twentieth Century Dictionary of the English Language
By Thomas Davidson