Formal:
* מיר איז שלעכט (Mir iz shlecht) - This literally means "I am bad" and is used to express feeling unwell, including fatigue.
* איך בין מיד (Ik bin mid) - This is a more straightforward translation of "I am tired."
Informal:
* איך בין צומיד (Ik bin tsumid) - This implies a feeling of being exhausted or worn out.
* איך בין שטויב (Ik bin shtoyb) - This literally means "I am dust" and is used to express feeling very tired, like you're falling apart.
* מיר איז שלעכט צו גיין (Mir iz shlecht tsu geyn) - This means "I feel bad to go," implying that you are too tired to move.
More informal:
* איך בין געמאכט (Ik bin gemakt) - This means "I am made," implying that you are exhausted and ready to fall asleep.
* איך בין אויסגעמאכט (Ik bin oysgemakt) - This is similar to "gemakt," but even more extreme, suggesting you are completely drained.
The best way to choose the right expression depends on the context and your desired level of formality.