Meaning of Unbeknownst
Adjective / বিশেষণ / विशेषण
unknown; unperceived; without one's knowledge (usually followed by to).
(sentence modifier) foll by to. without the knowledge (of a person): unbeknown to him she had left the country Also (esp Brit) unbeknownst
(rare) (postpositive) usually foll by to. not known (to)