If anyone can think of ANY other words with this form, it would be interesting indeed (although my guess is that any words following this pattern would have been created through analogy to "unbeknownst" and therefore only appear after it was coined in the 19th century).
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http://www.etymonline.com/index.php?search=unbeknownst&searchmode=none
If anyone can think of ANY other words with this form, it would be interesting indeed (although my guess is that any words following this pattern would have been created through analogy to "unbeknownst" and therefore only appear after it was coined in the 19th century).