Informal:
* 无聊 (wú liáo): This is the most common and direct way to say "bored."
* 没意思 (méi yì si): This literally means "no meaning" and implies that something is not interesting or engaging.
Formal:
* 厌烦 (yàn fán): This translates to "tired of" and suggests a feeling of weariness or annoyance.
* 乏味 (fá wèi): This means "tasteless" or "dull" and is a more literary way to express boredom.
Examples:
* 我很无聊。 (Wǒ hěn wú liáo.) - I'm so bored.
* 这本书真没意思。 (Zhè běn shū zhēn méi yì si.) - This book is really boring.
* 我对这个工作厌烦了。 (Wǒ duì zhège gōngzuò yàn fán le.) - I'm tired of this job.
Note: The specific choice of word will depend on the situation and your relationship with the person you are speaking to. For example, you might use "wú liáo" with friends, but "yàn fán" in a more formal setting.