Formal:
* 疲倦 (pí juàn): This is the most common and formal way to say "tired." It means "exhausted" or "fatigued."
* 劳累 (láo lèi): This word also means "tired" but often implies being tired due to hard work or physical exertion.
Informal:
* 累 (lèi): This is a more casual and commonly used word for "tired."
* 困 (kùn): This word specifically refers to feeling sleepy or drowsy.
Other:
* 疲惫不堪 (pí bèi bù kān): This phrase means "extremely tired" or "worn out."
* 精疲力尽 (jīng pí lì jìn): This phrase also means "exhausted" but implies being completely drained of energy.
Here are some examples of how to use these words in a sentence:
* 我很疲倦 (wǒ hěn pí juàn) - I am very tired.
* 他今天劳累了一整天 (tā jīntiān láo lèi le yī zhěng tiān) - He has been working hard all day.
* 我太累了,想睡觉 (wǒ tài lèi le, xiǎng shuì jiào) - I'm too tired, I want to sleep.
* 我有点困 (wǒ yǒu diǎn kùn) - I'm a little sleepy.
The best way to choose the right word for "tired" depends on the specific situation and the level of formality required.