不費力就走得動
這一支把核心畫面當好事看：輕鬆是因為底子夠，或條件夠溫和。
adjective · C2
Able to do something smoothly and without visible effort, especially writing or speaking. A facile pen or a facile style keeps moving and never seems to struggle.
流暢自如的
核心畫面
One way to hold this word: something that goes without pushing. The pen moves, the reaction runs, the win arrives — nothing had to be forced. That single picture is neutral on its own, and English has spent centuries deciding how to feel about it. Where the ease belongs to skill, the word praises. Where the ease belongs to the task being too small, the word turns cold.
可以想成：一樣東西不必用力推，自己就走得動。筆一直往下寫、反應自己跑起來、勝利輕輕鬆鬆就到手——沒有一樣需要硬逼。這…更多收起
可以想成：一樣東西不必用力推，自己就走得動。筆一直往下寫、反應自己跑起來、勝利輕輕鬆鬆就到手——沒有一樣需要硬逼。這個畫面本身不好也不壞。英文後來才決定對它的態度：如果輕鬆是因為本事夠，這個字是在稱讚；如果輕鬆是因為事情根本太小，這個字就變冷了。From the word’s history
Borrowed from Middle French facile, from Latin facilis 'easy to do', from facere 'to do, make'. The root sense is simply ease, which is why the neutral picture sits underneath both the praising and the critical uses.
借自中古法文 facile，源頭是拉丁文 facilis「容易做的」，再往前是動詞 facere「做」。字根只講「容易」，所以稱讚和批評這兩種用法，底下墊的其實是同一個中性畫面。
Wiktionary etymology supplied in the evidence packet (kaikki:3f6f69a190036ae4:522590806:19119)
Two branches
太容易，所以沒份量
同一個畫面翻面：不必用力，是因為該用力的地方被跳過去了。
adjective · C2
Used about a remark, an argument or an explanation that is too simple. It comes out neat and easy, but the person saying it has not thought the matter through, or does not really understand it.
淺薄的；想得太簡單的