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unofficial
01
lacking validation or approval from an established authority or organization
Example
The unofficial spokesperson provided information to the press without official approval.
The unofficial policy of flexible work hours was informally adopted by some employees.
Unofficial sources reported on the incident before any official statement was released.
02
非公式の, 正式でない
not officially established
word family
office
Noun
official
Adjective
unofficial
Adjective
