[syn: unbeknown, unbeknownst]
The Collaborative International Dictionary of English v.0.48:
Unbeknown \Un`be*known"\, a.
Not known; unknown. [Colloq.]
[1913 Webster]
WordNet (r) 3.0 (2006):
unbeknown
adv 1: without someone's knowledge; "unbeknownst to me, she made
all the arrangements" [syn: unbeknown, unbeknownst]
adj 1: (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" [syn:
unbeknown(p), unbeknownst(p)]