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So surprised that you cannot move or speak for a moment. It is much stronger than 'surprised': it is the frozen feeling you get when you hear news you never imagined — someone has died, or you have won, or a friend has told you a terrible lie. The picture inside the word is a person hit by lightning: you stand there, mouth open, nothing coming out. It is an adjective, and it almost always comes after the verb ('she was thunderstruck', 'he looked thunderstruck'), not in front of a noun — 'a thunderstruck man' sounds strange, though writers do it sometimes. The word feels a bit old-fashioned and literary; in everyday speech people say 'stunned', 'gobsmacked' (British and informal), or just 'I couldn't believe it'. Younger people may know it mainly as an AC/DC song. Note that the shock can be good or bad — either way, it stops you dead.
驚呆了、目瞪口呆、如遭雷擊（震驚到說不出話）
組成thunder（雷）+ struck（strike「打、擊中」的過去分詞）— literally 'hit by thunder'. Many languages build this idea the same way: Latin attonitus and German wie vom Donner gerührt both mean 'thunder-hit', and Chinese 如遭雷擊 does exactly the same thing.
同家族的字
- strikestruck is the past form of strike, 'to hit'
- struckthe same struck — as in 'struck by lightning'
- awestruckalso struck — hit by awe, by wonder
- starstruckalso struck — hit silly by meeting a famous person
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。
thunderstruckadj/ˈθʌn.də.stɹʌk/
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Astonished, amazed or so suddenly surprised as to be unable to speak.
- The overthrown he rais’d, and as a Heard Of Goats or timerous flock together throngd Drove them before him Thunder-struck,
- Therefore he whacked the old nigger mercilessly, while a big crowd of his people watched him, thunderstruck, till some man, - I was told the chief's son, - in desperation at hearing the old chap yell, made a tentative jab with a spear at the white man - and of course it went quite easy between the shoulder-blades.
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。