unbeknown Synonyms

unbeknownst able unapprehended uncharted undisclosed undiscovered unperceived unsuspected not known in the dark about unaware of ignorant of unknown to unbeknown to without knowledge of without being aware of without realizing unfamiliar unnamed unidentified absence absent anonymous enigmatic free knowledge mysterious nameless new obscure strange unawares unheard unknow unknown unknowingly in ignorance of