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There are probably some cases were words changed their meaning from positive to negative. (I know there are in German)
Contronyms are words that hold two opposite meanings
I didn’t mean contronyms.
One example of what I mean is the word knight. It used to mean boy or servant. The German word Knecht still means (farmers) servant.
Another is ‘nice’, which used to mean ‘simple, foolish, ignorant’.