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unknown

adjective B2 Neutral

Meaning

The term "unknown" describes something that is not recognized, identified, or familiar to a person or group.
💡 A common mistake is to confuse "unknown" with "unfamiliar"; while similar, "unknown" implies a lack of information rather than just a lack of recognition.

Example Sentences

Is the origin of this unknown object clear to you ?
The cause of the problem is still unknown to the experts .
The cause of the problem is still unknown to us .

Word in Context

Maria found an envelope on her kitchen table and noticed that the sender was unknown . She opened it slowly and read a short note asking if she had seen a small photo that belonged to someone in the building . Because she was curious , she decided to ask her neighbors about the photo and walked quietly down the hall . One neighbor said they had been looking for the same picture and explained that it was important because it showed a family celebration . They thanked Maria calmly when she handed the photo back , and she felt satisfied by the small but friendly ending to the morning .

Common Phrases

unknown factor unknown territory unknown consequences

Synonyms

Antonyms

Never forget "unknown"

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