精神露在外面：輕快，有時太直白
這一支最貼近核心：藏不住的那股精神往外跑。跑得討喜就是活潑，跑過頭就變成沒分寸。
adjective · C2
Lively, bright and quick in a cheerful way — used about a person's humour, manner, voice or a tune.
活潑俏皮的
核心畫面
A helpful way to hold pert is: nothing tucked away. The word is a form of apert, which carried the idea of being open, so picture whatever the word describes as standing out instead of staying down. A face that shows all its energy is pert. A remark that says the quiet part out loud is pert, and that is where the cheekiness comes from. A nose or a pair of ears that lift instead of drooping is pert too. Same upward, uncovered picture; three different things doing the lifting.
pert 可以想成「什麼都沒有收著」。它在中古英語是 apert 的縮短形，而 apert 帶著「打開、外顯」的意思…更多收起
pert 可以想成「什麼都沒有收著」。它在中古英語是 apert 的縮短形，而 apert 帶著「打開、外顯」的意思。所以不管它形容什麼，畫面都是往外、往上，而不是垂下去、藏起來。一個人精神全寫在臉上，是 pert。一句話把心裡的想法直接說出口，也是 pert——「沒大沒小」就是從這裡來的。一個鼻子、一對耳朵翹起來不塌下去，同樣是 pert。畫面一樣，只是翹起來的東西不同。From the word’s history
Wiktionary traces pert to Middle English pert, perte, an aphetic (clipped) form of apert. The packet also records an obsolete sense of pert meaning open, evident, unhidden, which lines up with that route and makes the 'nothing tucked away' picture easy to hold.
Wiktionary 記載 pert 來自中古英語 pert、perte，是 apert 被削掉開頭的形式。資料裡另外收了一個已經廢棄的意思：open、evident、unhidden（公開的、看得見的）。這剛好跟那條來源對得上，也讓「什麼都沒收著」這個畫面站得住。
Wiktionary (kaikki extract, source_ref kaikki:3f6f69a190036ae4:528114138): 'From Middle English pert, perte, aphetic form of apert'; plus the obsolete sense 'Open; evident; unhidden' (wikt:pert:adj:4).
Two branches
線條翹起來：小巧、挺、有精神
把「往外、往上、不塌下去」從態度換到身體，就成了這一支。
adjective · C1
Used about a part of the body that is small, firm and neatly shaped in a way people like — a pert nose, a pert chin, a dog's pert ears.
小巧俏挺的