Tastefulness is the noun: the quality of being tasteful. It names the thing itself — the good judgement, the restraint — rather than describing an object. 'The tastefulness of the design', 'a certain tastefulness in everything she wore'.

Tastefulness是 the noun名詞 the quality of being tasteful也就是「有品味」這種特質 It names它指的是 the thing itself這個特質本身 the good judgement, the restraint良好的判斷力、節制感 rather than而不是 describing an object在描述一個物品 The tastefulness of the design「設計的品味」 a certain tastefulness in everything she wore或「她穿的每一件都帶著某種品味」

Here is the honest part, and it matters more than the meaning: this word is rare. It is correct English, it appears in dictionaries, but people almost always find another way to say it. They say 'good taste' instead — 'the good taste of the design', 'she has wonderful taste'.

Here is這裡有 the honest part老實說的一點 and而 it matters more than the meaning比意思本身更重要 this word這個字 is rare很少用 It is它是 correct English正確的英文 it appears in dictionaries也會出現在字典裡 but但 people大家 almost always find another way to say it幾乎都會找別的方式來說 They大家 say 'good taste' instead會改說「good taste」 the good taste of the design「設計的好品味」 she has wonderful taste或「她的品味很棒」

Written down, tastefulness feels heavy and slightly academic, the kind of word you meet in an art review. So learn it so that you recognise it when you read it, but when you speak or write, reach for 'good taste'. That is not a rule, just what will make you sound like everyone else.

Written down寫下來的時候 tastefulness這個字 feels heavy and slightly academic感覺很沉重、有點學術味 the kind of word就是那種你會在 you meet in an art review藝術評論裡遇到的字 So所以 learn it把它學起來 so that讓 you recognise it when you read it你讀到時認得出來 but但 when you speak or write你說話或寫作時 reach for 'good taste'就伸手拿「good taste」來用 That is這 not a rule不是一條規則 just只是 what will make you sound like everyone else會讓你聽起來跟大家一樣的做法

Notice the pattern behind it, though, because that pattern is very useful: -ness takes a describing word and makes a noun for the quality. Kind → kindness, dark → darkness, careful → carefulness, tasteful → tastefulness. Once you see it you can read hundreds of words you have never met.

Notice留意 the pattern behind it它背後的規律 though不過 because因為 that pattern這個規律 is very useful非常實用 -ness -ness這個字尾 takes a describing word把一個形容詞 and而 makes a noun for the quality變成表示那種特質的名詞 Kind → kindnesskind變成kindness dark → darknessdark變成darkness careful → carefulnesscareful變成carefulness tasteful → tastefulnesstasteful變成tastefulness Once一旦 you see it你看懂這個規律 you can你就能 read hundreds of words讀懂上百個 you have never met你從沒見過的字