This is the 442nd most frequent Czech word.
nemusí
"Nemusí" means "does not have to" or "does not need to."
In this sentence, 'nemusí' is used to express lack of obligation or necessity, meaning 'does not have to' or 'may not'.
Toto řešení nemusí být správné.
This solution doesn't have to be correct.
Here, 'nemusí' indicates that there is no requirement or obligation to perform the stated action.
Nemusí tam jít, pokud se necítí dobře.
He/she doesn't have to go there if not feeling well.
In this sentence, 'nemusí' coupled with 'nutně' emphasizes that it is not strictly necessary for the situation to be true.