unbeknownst
adj.
1833, vulgar formation from unbeknown (1630s). No clear reason for the -st, but since 19c. this has become the dominant form.
| 词汇 | unbeknownst |
| 词根词缀 | Online Etymology Dictionary unbeknownst adj. 1833, vulgar formation from unbeknown (1630s). No clear reason for the -st, but since 19c. this has become the dominant form. |
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