unbeknownst

[ˌʌnbɪˈnoʊnst]
[ˌʌnbɪˈnoʊnst]
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An unbeknownst situation is one that someone isn't aware of, often because they weren't told or didn't see it.

You might hear "unbeknownst" used when someone wants to explain something surprising or unexpected that happened without their knowledge. For example, if your friend got a promotion at work but nobody told you about it until the day it was announced, it could be said that she had no idea her job was being changed unbeknownst to her.

How common is "unbeknownst"?

Word unbeknownst is considered rare in modern English.
It has a balanced usage among all categories: speech, fiction, newspapers and academic texts.
Definitions

adverb

  • (followed by to) without the knowledge of

    Example: He went home early, unbeknownst to his mother.

unbeknownunknown

Real examples of "unbeknownst" in context

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