unofficial /ˌʌnəˈfɪʃəl/ adjective Learner's definition of UNOFFICIAL
: not official非官方的;非正式的: such as
a : not formally chosen by an official decision or vote未经正式选定的 b : not done or made in a formal way by someone in a position of authority非正式的;非官方的 -
Unofficial estimates of the number of people killed in the earthquake range from 3,000 to 5,000.据非官方估计,地震遇难人数在3000人到5000人之间。
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I am including an unofficial translation of the speech.我正在收录该演讲的一个非正式译文。
c : not having the authority to make a statement, decision, etc.非官方的 d : not done in a public and formal way as part of someone's job非公事的;私人的