(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"
without someone's knowledge;
"unbeknownst to me, she made all the arrangements"
- He went there unbeknown to me.
- Unbeknown to his parents, he had not been to school for a week.
- His past is ancient and unbeknown just like his true power.
Unbeknown to Peter, part of the financial arrangements proved to be unsoundly based.出自： C. Warwick