Here are a few options for a WordPress post_tag description in Traditional Chinese, along with rationales to help you choose the best fit:

**Option 1: Concise & Direct**

* **Title:** 隨意 (Suíyì)
* **Description:** 用於描述輕鬆、不拘形式的內容。 (Yòngyú miáoshù qīngsōng, bùjū xíngshì de nèiróng.) – Used to describe relaxed, informal content.

* **Rationale:** This is a straightforward and easily understood option. “隨意” (suíyì) is the direct translation of “informal.” The description is clear and tells the user what to expect.

**Option 2: More Descriptive & Contextual**

* **Title:** 非正式 (Fēi zhèngshì) or 輕鬆 (Qīngsōng)
* **Description:** 此標籤用於標記不嚴肅、輕鬆、口語化的文章、觀點或資訊。 (Cǐ biāoqiān yòngyú biāojì bù yánsù, qīngsōng, kǒuyǔhuà de wénzhāng, guāndiǎn huò zīxùn.) – This tag is used to mark articles, opinions, or information that are not serious, relaxed, and colloquial.

* **Rationale:** “非正式” (fēi zhèngshì or “輕鬆” (qīngsōng) are alternative translations that focus on the lack of formality or the sense of ease. The description elaborates on the kinds of content the tag applies to (articles, opinions, information), making it helpful for users. “口語化” (kǒuyǔhuà) emphasizes a more spoken / conversational tone.

**Option 3: Emphasis on the contrast with formal**

* **Title:** 非正式 (Fēi zhèngshì)
* **Description:** 標記內容不屬於正式、官方或嚴謹的範疇。 (Biāojì nèiróng bù shǔyú zhèngshì, guānfāng huò yánjǐn de fànchóu.) – Marks content that does not belong to the formal, official, or rigorous category.

* **Rationale:** This option highlights the opposite of “informal”. It explicitly states what the tagged content *isn’t*. This can be helpful if you’re using this tag in conjunction with a “formal” tag.

**Option 4: A bit more playful (use if the overall tone of your site is casual)**

* **Title:** 輕鬆 (Qīngsōng)
* **Description:** 這裏的內容就像跟朋友聊天一樣！ (Zhèlǐ de nèiróng jiù xiàng gēn péngyou liáotiān yīyàng!) – The content here is just like chatting with friends!

* **Rationale:** This option tries to capture the feeling of informality. It communicates the tone of the content directly, which may be more effective if appropriate for your website audience.

**How to Choose:**

* **Consider your target audience:** Are they primarily Mandarin speakers who prefer a more literal translation? Or are they more comfortable with slightly more descriptive, perhaps less formal, explanations?
* **Think about the overall tone of your website/blog:** Does it lean towards a professional image, or is it casual and friendly? Choose a description that fits the environment.
* **Clarity is key:** Regardless of your choice, ensure the description is easy to understand.

**How to enter the description in WordPress:**

1. Go to your WordPress admin panel.
2. Go to “Posts” then “Tags.”
3. Find the “informal” tag in your tag list (if you haven’t created it already, create it).
4. In the *Description* field, enter the chosen description in Traditional Chinese.
5. Click “Update.”

I recommend starting with **Option 1 or Option 2**, but consider the tone of your website when making the final decision. Good luck!