Unbeknownst

//ˌʌnbɪˈnoʊnst// adj

Definitions

Adjective
  1. 1
    Without the knowledge of. not-comparable, with-to

    "He went home early, unbeknownst to his mother."

Adjective
  1. 1
    (usually used with ‘to’) occurring or existing without the knowledge of wordnet
Adverb
  1. 1
    without someone's knowledge wordnet

Etymology

Variant of unbeknown with excrescent -st.

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