For someone who is not intelligent:
* Głupi: This is the most common and direct translation. It's considered a neutral word, not necessarily offensive but can be considered rude depending on the situation.
* Głupkowaty: This is a more informal and playful way to say someone is dumb. It's less harsh than "głupi".
* Niedorozwinięty: This is a medical term for someone with intellectual disabilities. It should be used with great caution and sensitivity.
For someone who is acting foolishly:
* Głupi: This can also be used for someone behaving foolishly, but "głupkowaty" is more appropriate in this context.
* Głupczy: This is a more informal word for someone acting stupid. It's considered more offensive than "głupkowaty."
* Bezmyślny: This word means "thoughtless" and is used when someone is doing something without thinking of the consequences.
For someone who is mute:
* Niemowy: This is the word for someone who cannot speak.
It's important to consider the context and the tone you want to convey when choosing the right word. If you're unsure, it's always best to use a more neutral word like "głupi" or ask a Polish speaker for their opinion.
Remember, words can be hurtful and it's important to be mindful of the language you use.