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When something happens inexorably, it keeps going and nobody can stop it. The word is rather formal — you meet it in news, history, and serious writing more than in chat. People use it for slow, heavy things: ice melting, an illness getting worse, a company going down, a deadline coming closer. There is a feeling of no mercy in it, as if you cannot talk the thing out of going on. Though actually, speakers sometimes use it just to mean “slowly but surely,” even when a person could still change course. That is a looser use. It is not a word for a small , like a late bus.
無法阻擋地、勢不可擋地（偏書面）
組成inexorable + -ly. The -ly makes an adverb: in a way that cannot be stopped.
同家族的字
- inexorablethe adjective; this adverb is inexorable + -ly
原始詞典資料1 筆記錄
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。
inexorablyadv/ɪnˈɛk.sə.ɹə.bli/
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In an inexorable manner; without the possibility of stopping or prevention.
- We watched as the storm clouds advanced inexorably closer to us.
- One of his best stories was "Barney Oldfield's Race for a Life" (1914), of which there survives only an amusing still, showing poor Mabel Normand chained to the rails by two toughs, the moustached villain threatening her with a sledge-hammer, and an awful sense of that inexorably approaching express!
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。