Webster's English Dictionary

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preposterous

pre.pos.ter.ous \pri-'pa:s-t(*-)r*s\ aj [L praeposterus, lit., with the 
   hindside in front, fr. prae- + p]osterus hinder, following - more at 
   POSTERIOR : contrary to nature, reason, or common sense : ABSURD  - 
   pre.pos.ter.ous.ly av