unbeknown

adj. desconocido

adj. desconocido, ignorado, no conocido, no sabidoadv. sin conocimiento, por sorpresa

Ex: Unbeknown to the users who accessed the system, the knowledge-base included two human experts, communicating with them from a different building, via the computer screen.

(adj.) = sin saberlo, sin ser consciente de ello, sin conocimiento de causa
Ex: Unbeknown to the users who accessed the system, the knowledge-base included two human experts, communicating with them from a different building, via the computer screen.