Definitions

1. adverb

without knowledge or awareness of a fact or situation.

“They were unaware of the surprise party, but were delighted when they walked into the room unbeknown to them.”

2. noun

a person or thing that is unknown or not recognized.

“The company’s financial troubles were a secret unbeknown to the investors until the news broke.”

3. adverb

without one’s knowledge or consent.

“The company had been secretly working on the new project unbeknown to its competitors.”