dumbed down

from Jargon File (4.4.4, 14 Aug 2003)
dumbed down
 adj.

   Simplified, with a strong connotation of oversimplified. Often, a
   {marketroid} will insist that the interfaces and documentation of
   software be dumbed down after the designer has burned untold gallons
   of midnight oil making it smart. This creates friction. See
   {user-friendly}.
    
from The Free On-line Dictionary of Computing (8 July 2008)
dumbed down

   <jargon> Simplified, with a strong connotation of
   *over*simplified.  Often, a {marketroid} will insist that the
   interfaces and documentation of software be dumbed down after
   the designer has burned untold gallons of midnight oil making
   it smart.  This creates friction.

   See {user-friendly}.

   (1995-04-14)
    

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