Here are some possible antonyms, depending on the context:
For "missing someone":
* Masaya (happy): This implies the opposite of longing or missing someone.
* Walang pakialam (indifferent): This suggests not caring about someone's absence.
* Natutuwa (pleased): This indicates a positive emotion that contrasts with the sadness of missing someone.
For "missing something":
* Mayroon (having): This indicates possession of something, the opposite of missing it.
* Kontento (content): This expresses satisfaction and the lack of desire for something else.
* Masaya (happy): This could imply contentment and the absence of longing for something.
Ultimately, the most accurate antonym will depend on the specific context in which "nangungulila" is used.