Meaning & usage
なしに means an action happens without something that would normally accompany it, like permission, notice, or preparation. It follows a noun, often in the pattern Noun + なしに, and も or は can be added for emphasis, as in 断りもなしに or テレビなしには, and verb phrases become nouns with こと before it, as in 教えられることなしに. It sounds rather formal and written, so it is common in notices and rules, and the following verb is often negative or potential when stressing that something is impossible without that noun.
Example sentences 3
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その取り決めは、予告なしに変わることがある。
The arrangements are subject to change without notice.
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彼女は何の断りもなしに私の車を運転した。
She drove my car without so much as asking.
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私はテレビなしには過ごせない。
I can't dispense with watching television.
In past JLPT papers
This came up in 4 past exam questions.