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Responding to something after it happens, instead of planning ahead or acting first — a 'reactive' approach to problems means you deal with them only once they show up, which is often seen as less ideal than being 'proactive' (planning ahead). In chemistry, 'reactive' describes a substance that easily reacts with other substances, sometimes in a strong or dangerous way, like a 'highly reactive chemical.'
被動應對的、事後反應的（proactive 的反義）；（化學）易起反應的
原始詞典資料4 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。
reactiveadj/ɹiːˈæktɪv/
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That reacts or responds to a stimulus.
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chemistrynatural-sciencesphysical-sciencesThat readily takes part in reactions.
- francium is the most reactive of the alkali metals.
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businesselectrical-engineeringelectricityCharacterized by induction or capacitance rather than resistance.
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Reacting to the past rather than anticipating the future, not predictive.
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。