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Don't make it a person. The best example is The Raven who only says "Nevermore." This is very clearly a very intelligent being and yet his lexicon is limited to not only one word but a "kind of a ...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/24996 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/