Find the word definition

Douglas Harper's Etymology Dictionary
unbeknownst

1833, vulgar formation from unbeknown (1630s). No clear reason for the -st, but since 19c. this has become the dominant form.

Wiktionary
unbeknownst

adv. (''followed by '''to''''') without the knowledge of

WordNet
unbeknownst
  1. adj. (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)]

  2. adv. without someone's knowledge; "unbeknownst to me, she made all the arrangements" [syn: unbeknown]

Usage examples of "unbeknownst".

Unbeknownst to us, the raiders doubled back and a dozen of them ambushed us.

Although some would like to believe the lines represent prehistoric runways for ancient astronauts, we now know them to be astronomically aligned, marking the positions of the winter solstice, the equinox, the constellation of Orion, and perhaps other heavenly bodies as yet unbeknownst to us.

Only Tulla, unbeknownst to the grownups, but before our eyes as we looked on with a tightening of the throat, took long avid gulps of the brownish-gray broth in which the coagulated excretion of the kidneys floated sleetlike and mingled with blackish marjoram to form islands.

HIV virus while performing cardiopulmonary resuscitation on a patient who, again, unbeknownst to you, was positive for HIV or AIDS.

Linscott, who had, unbeknownst to the other faculty, been carrying on a torrid affair with Mister Taupin, the greensman, had been coming to call on the man who was her secret shame when she had discovered the trio of youths bullying Malcolm Reed near the fountain.

Unbeknownst to Eliot, Viv had sneaked back into the castle and hidden the remaining stolen stamps in the jam jar, again using her knowledge of his security system and his stillroom hobby to conceal the valuables in a way that would point away from her, if they were discovered.

In fact, unbeknownst to Olivia, she had sent a letter to Emmeline Pankhurst in prison.

For, unbeknownst to themselves, the Infernals and the Settlers on that aptly named world were forced to face a remarkable change in the very nature of robots themselves.

There were on many worlds bloodsucking creatures which released anticoagulants that allowed blood to flow painlessly and unbeknownst to the host animal.

Although some would like to believe the lines represent prehistoric runways for ancient astronauts, we now know them to be astronomically aligned, marking the positions of the winter solstice, the equinox, the constellation Orion, and perhaps other heavenly bodies as yet unbeknownst to us.

He had, unbeknownst to Leovinus, instructed contractors to halve and then quarter the specifications of any number of elements on board.

What an ironic pity, to think you were pretending to be sick, when unbeknownst to you, you were, in fact, fatally ill.

Out of all the scuba shops in Bermuda she was lucky enough to pick one that, unbeknownst to her, offered treasure hunting along with boat trips.

For, unbeknownst to themselves, the Infernals and the Settlers on that aptly-named world were forced to face a remarkable change in the very nature of robots themselves.

Unbeknownst to her, one of his ancillary tasks in accepting the Parramat assignment was to render and report a formal job evaluation on one Fawn Seaforth.