unofficial
[ˌʌnəˈfɪʃəl]
adj.
非官方的，非正式的;
不作为官方活动的;
例句:
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Berlin's unofficial motto is poor, but sexy.
来自WSJ
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Salesmen of unofficial souvenirs have also been doing a roaring trade.
出售非官方纪念品的推销员的生意也很红火。
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Unkempt about those hedges blows An English unofficial rose.
来自transf.
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Unofficial estimates put the figure at over two million.
非官方的估计数字为200万以上。
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But this does not rule out unofficial discussions.
但这并不排除进行非正式的讨论.
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But "unofficial" Islam sustained the true faith.
来自NEWYORKER