Unbeknownst vs. Unbeknown — What's the Difference?

"Unbeknownst" and "unbeknown" are adjectives that describe something not known or not realized by someone. The primary difference between the two lies in their usage and frequency in contemporary language. "Unbeknownst" is the variant more commonly found in modern English, particularly in American English, and is often followed by "to" to indicate to whom something is unknown. For example, "Unbeknownst to her, the plans had changed." It suggests that the information or situation was not known to a particular person or group at a specific time.

"Unbeknown," on the other hand, is an older form and less commonly used in current language, though it is still understood and recognized as correct. It serves the same function as "unbeknownst," indicating that something is not within someone's knowledge or awareness. For instance, "Unbeknown to him, he was about to enter a trap." This form might be seen in more formal or literary contexts, reflecting a stylistic preference rather than a difference in meaning.

The choice between "unbeknownst" and "unbeknown" largely depends on the writer's or speaker's preference, regional language norms, and the context in which it is used. Despite their slight variations in form, the meaning conveyed by both words is the same, and they can be used interchangeably without altering the essence of the message.

In terms of usage, it's important to consider the audience and the setting. "Unbeknownst" is more universally recognized and therefore might be a safer choice in general communication, while "unbeknown" could be employed for stylistic reasons or in specific contexts where its older connotation is desired.