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In reply to the discussion: Witness responds to suggestion that Trayvon lied before getting shot: ‘That’s real retarded, sir’ [View all]mwooldri
(10,825 posts)The Oxford English Dictionary agrees with you. It states that it has become an offensive word over the years.
http://oxforddictionaries.com/definition/english/retarded?q=retarded
As for "gay" it used to be acceptable to call something "gay". Today it would be confusing at least. The word "gay" changed its meaning, also becoming a noun in the process.
The English language is a very fluid language which does change over time. And yes words do change meanings. The word "wireless" is not associated with AM/FM radio but is now associated with cellular mobile telephones. Strangely enough I do call the radio "the wireless" because that is the word I have associated with it, and don't use it with respect to mobile phones.
You have challenged my thinking and I thank you. In respect to the OP and the witness using that particular phrase, replacing that word with a synonym makes the sentence as a more direct insult to the lawyer who was questioning her. She could have used a better choice of words.
Again, thank you.