Unbeknownst Definition

ŭnbĭ-nōnst
adjective
Unbeknown.
American Heritage
Unknown or unperceived; without one's knowledge.
Webster's New World
Synonyms:
adverb
Without the knowledge of a specified party. Used with to .
Our cousin had been ill for years, unbeknownst to the family.
American Heritage
Synonyms:

Origin of Unbeknownst

  • C. 1636: unusual form of un- +"Ž beknown

    From Wiktionary

  • unbeknown -st (as in amongst)

    From American Heritage Dictionary of the English Language, 5th Edition

  • WOTD - 23 June 2012

    From Wiktionary

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