Is it grammatical Yes and natural? No Without context, my guess is that retardation means stupidity. We used to say that someone with mental problems wa s retarded, or was a ****** .
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Is it grammatical Yes
and natural? No
Without context, my guess is that retardation means stupidity.
We used to say that someone with mental problems was retarded, or was a ******.
These words relate to slowness.
Please, please, please note that this way of talking about people who have this problem is today considered unk