unknown; unperceived; without one's knowledge (usually followed by to).

Nearby words

  1. unbearable,
  2. unbeatable,
  3. unbeaten,
  4. unbecoming,
  5. unbegotten,
  6. unbeknownst,
  7. unbelief,
  8. unbelievable,
  9. unbelievably,
  10. unbeliever

Also un·be·knownst [uhn-bi-nohnst] /ˌʌn bɪˈnoʊnst/.

Origin of unbeknown

1630–40; un-1 + beknown (late Middle English beknowe, past participle of beknowen); see be-, known

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for unbeknownst

British Dictionary definitions for unbeknownst



(sentence modifier foll by to) without the knowledge (of a person)unbeknown to him she had left the country Also (esp Brit): unbeknownst


(postpositive usually foll by to) rare not known (to)

Word Origin for unbeknown

C17: from the archaic beknown known; see be-, know

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for unbeknownst
Online Etymology Dictionary, © 2010 Douglas Harper