There are a few ways to say Indonesia in Chinese, and the tone of voice you use will depend on the context.
The most common way to say Indonesia is “印度尼西亚” (yìndùníxīyà), which is pronounced “een-doo-nee-shee-yah”. This is the official name of Indonesia in Chinese, so it would be used in official contexts, such as when talking to a government official or in a news report.
Another way to say Indonesia is “印尼” (yìnní), which is pronounced “een-nee”. This is …