TREACHEROUSLY

\tɹˈɛt͡ʃəɹəsli], \tɹˈɛt‍ʃəɹəsli], \t_ɹ_ˈɛ_tʃ_ə_ɹ_ə_s_l_i]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd
 
1914 - Nuttall's Standard dictionary of the English language
By Nuttall, P.Austin.
 
1871 - The Cabinet Dictionary of the English Language