Informal:
* Sahau hilo: This is the most common and direct translation. It literally means "forget that."
* Usijali: This means "don't worry" and can be used to dismiss something unimportant.
* Wacha: This means "leave it" or "let it be" and can be used to indicate you don't want to think about it anymore.
Formal:
* Usilifikirie hilo: This translates to "don't think about that."
* Samahani, lakini siwezi kulifikiria hilo: This means "Excuse me, but I can't think about that."
Example situations:
* Friend: "Let's go to the movies tonight."
* You: "Forget that, I'm too tired." (Sahau hilo, nimechoka sana)
* Boss: "We need to finish this project by tomorrow."
* You: "Forget that, it's impossible." (Wacha, haiwezekani)
The best choice depends on the specific situation and your relationship with the person you are speaking to.