Webster's English Dictionary

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presumptuous

pre.sump.tu.ous \pri-'z*m(p)-ch*-w*s; -'z*m(p)-sh*s, -ch*s\ aj [ME, fr. MF 
   presumptueux, fr. LL praesumptuosus, irreg. fr. prae]sumptio : overstepping 
   due bounds : taking liberties : OVERWEENING  - pre.sump.tu.ous.ly av