IMPERCEPTIVE

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