Definition
'Unbeknownst' is synonymous with 'unbeknown,' meaning without the knowledge of someone. It emphasizes that a person is unaware of something that is happening or has happened. It suggests a sense of secrecy or hidden action. 'Unbeknownst' adds a slightly more formal or archaic feel compared to 'unbeknown.' It can create a dramatic effect, hinting at something significant occurring behind the scenes. Like a plot twist!