You must be thinking of nadir, nidus is pronounced with the long i sound. Nadir would be a good follow up word for nadir to soundly confuse everyone. LOL
oops follow up for nidus.....see, it’s contagious.
I think i may have created a NEW word.
Nadis: A nest of villainy that has become the lowest point to which a person can sink.
What do you think?