unbeknownst

As he'd eaten this particular brand before, he didn't check the packaging but, unbeknownst to him, the ice cream now contained pea protein and caused another allergic reaction.

But unbeknownst to the miners, Murderbot has been able to hack its governor module, its system, so it's gained autonomy, free will.

Grier: I did an episode of a sitcom in which it was assumed, unbeknownst to me, that I was very proficient playing an upright bass.

But unbeknownst to the family, something extraordinary was taking place behind the scenes.

I texted him and asked him to join me at the pool but unbeknownst to me he had left his phone in the room.