unbeknown

[ UK /ʌnbɪnˈə‍ʊn/ ]
[ US /ˌənbiˈnoʊn, ˌənbɪˈnoʊn/ ]

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
she had been ill for months, unbeknownst to the family

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How To Use unbeknown In A Sentence

When he returned home she said he continued to tinker with the bike but, unbeknown to her, he then went out on it.
They even let people vote without identification - although, unbeknown to the voters, they then marked their ballots as invalid.
With no bomb-shell of an October surprise namely a tape coming from Osama bin Laden as was done in the 2004 presidential campaign; a self-inflicted November surprise came about today when Sarah Palin took an active part in a prank phone call unbeknownst to her. Sarah Palin and the prank call: The GOP's self-inflicted November surprise
Unbeknown to me, he'd gone and rented out the apartment in my absence.
That's why I got you here unbeknown to anyone in the village. MOONDROP TO MURDER
Unbeknown to Garay, his passenger was armed with a rifle with a telescopic lens.
I am appalled that children can mount up debts unbeknown to their parents.
And when I wasn't playing it, it was replaying itself in my head - unbidden and sometimes almost unbeknownst.
Perhaps unbeknown to you, the first lady has been churning out a weekly column since July 30 of last year.
But unbeknown to the Japanese, Soviet leader Josef Stalin had promised Washington and London that he would attack Japanese forces within three months of Germany's defeat.