Antonyms of adj unbeknownst

1 sense of unbeknownst

Sense 1
unbeknown (predicate), unbeknownst (predicate) -- ((usually used with `to') occurring or existing without the knowledge of; "a crisis unbeknown to me"; "she had been ill for months, unbeknownst to the family")

INDIRECT (VIA unknown) -> known -- (apprehended with certainty; "a known quantity"; "the limits of the known world"; "a musician known throughout the world"; "a known criminal")

Similarity of adj unbeknownst

1 sense of unbeknownst

Sense 1
unbeknown (predicate), unbeknownst (predicate) -- ((usually used with `to') occurring or existing without the knowledge of; "a crisis unbeknown to me"; "she had been ill for months, unbeknownst to the family")
       => unknown (vs. known) -- (not known; "an unknown amount"; "an unknown island"; "an unknown writer"; "an unknown source")

Synonyms of adv unbeknownst

1 sense of unbeknownst

Sense 1
unbeknown, unbeknownst -- (without someone's knowledge; "unbeknownst to me, she made all the arrangements")

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