American Heritage Dictionary
(2)
Century Dictionary
(1)
GNU Webster's 1913
WordNet
(2)
Elsewhere on the web
P.S. When I hear the word unbeknownst, all I think about is Jeff Conway and Daniel Baldwin's confrontation where Daniel said "unbeknownst to Jeff ...." and Jeff just kept screaming "no I fucking did not, take it back".— radioactive girl
Unbeknownst has been looked up 209 times, favorited 0 times, listed 19 times, and commented on once.

American Heritage Dictionary (1)
Bubble size: how much this word was used in a year
Bubble height: used more or less than expected, vs. all uses evenly distributed
You can expect to see this word several times a year.
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