One way to hold this word: think of the world as the everyday human business of money, deals, bargaining, and knowing how things get done. means inside that room. The un- puts someone, or something, outside it. From outside the room you can be a person who never wanted what is in there, a person who has not yet walked in, or a thing that seems to have come from somewhere else entirely.
可以想成：這裡的 world 指的是我們每天過的現實生活——錢、買賣、人情、怎麼把事情辦成。worldly 是待在那個房間裡面的人。un- 把人或東西放到房間外面。而站在房間外面，有三種樣子：一種是根本不想要裡面那些東西；一種是還沒走進去、所以不熟裡面的規矩；還有一種不是人，是一樣東西或一個地方，美得、靜得好像不是從那個房間來的。
From the word’s history
The source records the word simply as un- + worldly, so the modern meanings all sit on top of that plain build: not of the world.
來源把這個字記成 un- + worldly。所以今天的三個意思，其實都疊在同一個很直白的組合上：不屬於這個世界。往人身上走，就是不在乎錢或還沒見過世面；往東西上走，就是不像人間該有的。
Wiktionary entry 'unworldly' (kaikki snapshot 3f6f69a190036ae4): "From un- + worldly."
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