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Definition of Unbeknownst
1. Adverb. Without someone's knowledge. "Unbeknownst to me, she made all the arrangements"
Exact synonyms: Unbeknown
2. Adjective. (usually used with 'to') occurring or existing without the knowledge of. "She had been ill for months, unbeknownst to the family"
Definition of Unbeknownst
1. Adverb. (''followed by '''to''''') Without the knowledge of. ¹
¹ Source: wiktionary.com
Definition of Unbeknownst
1. [adj]