1. (

• unbeknown ,
• unbeknownst

) (usually used with `to') occurring or existing without the knowledge of; "a crisis unbeknown to me"; "she had been ill for months, unbeknownst to the family" ;

1. (

• unbeknown ,
• unbeknownst

) without someone's knowledge; "unbeknownst to me, she made all the arrangements" ;