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