This is the 490th most frequent Portuguese word.
nenhuma
"None" or "no" (feminine, singular).
The word 'nenhuma' is used to mean 'no' in a negative statement to emphasize the lack of something.
Não havia nenhuma razão para ela estar tão nervosa.
There was no reason for her to be so nervous.
In this sentence, 'nenhuma' emphasizes the total absence of questions brought by her.
Ela não trouxe nenhuma dúvida para a reunião.
She did not bring any question to the meeting.
Here, 'nenhuma' is applied to highlight the complete nonexistence of correct answers found.