unknown

adjective B2

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 .

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