Definition of unknown to
: without being known about by (someone) Unknown to me, my partner was organizing a surprise party for my birthday.
Word by Word Definitions
: not known or not well-known
: having an unknown value
: one that is not known or not well-known
: a person who is little known (as to the public)
: something that requires discovery, identification, or clarification: such as
Seen and Heard
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