How to Say "to object" in Spanish
The Spanish word for “to object” is “protestar” — A2 level. This is a very common word in everyday Spanish.

Examples
El niño empezó a protestar porque no quería irse a la cama.
The boy started to complain because he didn't want to go to bed.
No sirve de nada protestar; la decisión ya está tomada.
It's no use objecting; the decision has already been made.
Los vecinos protestan por el ruido de la construcción.
The neighbors are complaining about the construction noise.
Using 'por' for the reason
When you want to say WHY you are complaining, use the word 'por'. For example: 'Protesto por el mal servicio' (I'm complaining about the bad service).
Don't confuse with 'quejarse'
Mistake: “Using 'protestar' for every tiny physical pain.”
Correction: Use 'protestar' for vocalizing disagreement with a situation. Use 'quejarse' for physical pain or constant whining (e.g., 'Me quejo de la espalda').
Related Translations
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