I might be able to help!! i just need to know what time period or dynasty
Hey there,
I don't get your question but I can explain what a plateau is:
https://en.wikipedia.org/wiki/Plateau
The correct answer is - dysphasic or dysphonic.Dysphasia is a speech disorder that makes it difficult for a person to generate speech and sometimes also understand it. It is generally a symptom of brain damage or disease. Dysphonia is a similar condition but it's caused by a physical disorder of speech organs.
Duboise because they were Portuguese