Here are a few options for the WordPress post_tag description for “貓咪不快樂” (Māo mī bù kuài lè – Unhappy Cats) in Traditional Chinese, with varying levels of detail and focus:

**Option 1 (Concise and General):**

貓咪心情不佳、憂鬱、或是不開心的相關文章彙總。
*(Māo mī xīn qíng bù jiā, yōu yù, huò shì bù kāi xīn de wén zhāng huì zǒng.)*
*Translation: Compilation of articles about cats with bad moods, depression, or unhappiness.*

**Option 2 (Slightly More Descriptive):**

此標籤涵蓋討論貓咪不開心原因、徵兆，以及如何改善貓咪情緒的文章。
*(Cǐ biāo qiān hán gài tǎo lùn māo mī bù kāi xīn yuán yīn, zhēng zhào, yǐ jí rú hé gǎi shàn māo mī qíng xù de wén zhāng.)*
*Translation: This tag covers articles that discuss the reasons for unhappy cats, their symptoms, and how to improve their mood.*

**Option 3 (Focus on Solutions):**

幫助你了解貓咪為何不快樂，並提供改善貓咪幸福感的技巧、建議與資訊。
*(Bāng zhù nǐ liǎo jiě māo mī wèi hé bù kuài lè, bìng tí gōng gǎi shàn māo mī xìng fú gǎn de jì qiǎo, jiàn yì yǔ zī xùn.)*
*Translation: Helping you understand why cats are unhappy, and providing techniques, suggestions, and information to improve their happiness.*

**Option 4 (Adding Keyword for Search):**

貓咪心情低落、憂鬱？這裡收集了關於貓咪不快樂的原因、照顧方式、改善辦法。 包含貓咪行為分析、環境改善與玩具推薦等等。
*(Māo mī xīn qíng dī luò, yōu yù? Zhè lǐ shōu jí le guān yú māo mī bù kuài lè de yuán yīn, zhào gù fāng shì, gǎi shàn bàn fǎ. Bāo hán māo mī xíng wéi fēn xī, huán jìng gǎi shàn yǔ wán jù tuī jiàn děng děng.)*
*Translation: Is your cat feeling down, depressed? Here we collect information about the causes of unhappy cats, how to care for them, and ways to improve their mood. Includes cat behavior analysis, environmental improvements, and toy recommendations, etc.* (This option is good for SEO.)

**Which option to choose depends on the audience and specific content of your website.** If your site focuses on providing solutions, Option 3 or 4 would be best. If your content is more general, Option 1 or 2 would suffice. Option 4 is great if you want to help people search. Remember to choose the description that best reflects the content associated with this tag.