Definition of "Unbeknown" :
adjective: (usually used with to') occurring or existing without the knowledge of
"A crisis unbeknown to me."
adverb: without someone's knowledge
"Unbeknownst to me, she made all the arrangements."
adjective: (usually used with to') occurring or existing without the knowledge of
"A crisis unbeknown to me."
adverb: without someone's knowledge
"Unbeknownst to me, she made all the arrangements."