It's pronounced "N-da" with a slight emphasis on the "N" sound.
Here are some examples:
* Nda, ndomeka." (No, I don't want it.)
* Nda, niendaga." (No, I'm not going.)
* Nda, ndakwenda." (No, I don't love you.)
Important Note: The context is crucial when using "Nda" as the tone and inflection can subtly change the meaning.