Dictionary

unbeknownst

unbeknownst

adjective un·be·knownst \ˌən-bi-ˈnōn(t)st\

Definition of UNBEKNOWNST

1
:  happening or existing without the knowledge of someone specified —usually used with to <unbeknownst to us rumors were flying>
2
:  unknown

Variants of UNBEKNOWNST

un·be·knownst also un·be·known \-ˈnōn\

Examples of UNBEKNOWNST

  1. <unbeknownst to me, my mother was planning a party>

Origin of UNBEKNOWNST

1un- + obsolete English beknown known; unbeknownst, irregular from unbeknown
First Known Use: 1636

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