Picture something that has been brought inside and has settled there. A wolf's family line ends up asleep by the fire; a wild grass ends up growing in a field someone planted; a person who never cooked ends up with soup on the stove. In every case the word looks at the end of that road, not at the journey: this one belongs to the house now.
Wiktionary gives domesticated as domesticate plus -ed, so the word names a finished result rather than an action in progress.
Wiktionary 記錄 domesticated 是 domesticate 加上 -ed。所以這個字講的是「已經完成的結果」，不是正在做的動作，這也是它一直帶著「已經安頓好了」味道的原因。
Wiktionary (kaikki extract, entries domesticated/verb and domesticated/adj): "From domesticate + -ed."
Two branches
被人養出來的動物和植物
這是畫面最原本的用法：一整個種類被帶進人的生活，而且再也回不去野外的樣子。
adjective · B2
An animal, or sometimes a plant, that people have kept and bred over many generations, so that it now lives with people or is grown by them — working for them, giving food, or being kept as a pet — instead of living wild.
馴化的
待在家裡也做得來家事的人
把同一個畫面搬到人身上：這個人也安頓在家裡了。因為原本是講動物的字，用在人身上就自然帶著打趣的味道。
adjective · B2
Someone who is domesticated is happy spending time at home and is willing and able to do the work that home life needs — cooking, cleaning and looking after the place.
顧家的
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
domesticatedadj
Selectively bred to live with or around humans. (of an animal or a plant, especially a pet)
這個拼法也被記錄為下列字的變化形：
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。