Webster's English Dictionary

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inconsistent

in.con.sis.tent \.in-k*n-'sis-t*nt\ aj : lacking consistency : as  : not 
   compatible with another fact or claim {~ statements}  : containing 
   incompatible elements {an ~ argument}  : incoherent or illogical in thought 
   or actions : CHANGEABLE  - in.con.sis.tent.ly av