characterized by extreme simplism; oversimplified: a simplistic notion of good and bad.

1855–60; simple + -istic

simplistically, adverb

simple, simplified, simplistic (see confusables note at the current entry).

Contrary to what some people believe, simplistic is not a fancy word for simple. Simplistic does not describe things that are easy to understand, deal with, or use. Those sorts of things are simply simple. However, if something is too simple—misleadingly so—then it is correctly called simplistic. An argument that glosses over or omits relevant facts and presents trite, hackneyed, slogan-like statements and sound bites is indeed simplistic.
Simple—unlike simplistic—is a term that can describe not only issues, statements, and arguments, but all manner of things observable by our senses. It can describe art, music, food, clothing—just about anything. And it is a neutral term. That is, if something is said to be simple, that can be considered either a good thing or a bad thing depending upon one’s taste. But the word is very often used positively—as encapsulated in the well-worn creative principle “Less is more”—to describe language that is straightforward and easy to understand, clothing that is not overly elaborate or excessively decorated, or architecture with clean lines. And something simple can be elegant too. To describe such things as simplistic would be an insult to their creators. And it would be ironic to use what one thinks of as a more exotic, ornamental, impressive term to describe something clear or plain and unadorned—something that is, in fact, simple. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
simplistic (sɪmˈplɪstɪk)
1.  characterized by extreme simplicity; naive
2.  oversimplifying complex problems; making unrealistically simple judgments or analyses
usage  Since simplistic already has too as part of its meaning, it is tautologous to talk about something being too simplistic or over-simplistic

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1881, "trying to explain too much by a single principle," earlier (1860) "of or pertaining to simples" (herbs used in healing; the notion is of medicine of one ingredient only), from simplist "one who studies simples" (1597); see simple.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Your idea that simple electrical equipment won't be damaged is simplistic here.
The new bands are totally simplistic in lyrical content, and musical ability.
But some researchers are cautioning against what they consider a simplistic and
  pessimistic viewpoint.
Checklists seem lowly and simplistic, but they help fill in for the gaps in our
  brains and between our brains.
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