Usage priority
Collins 词频等级为 2，建议结合例句记忆，而不是只背中文释义。
非正式的
先理解核心含义，再看它在真实句子里的用法。
非正式的；非官方的；[化] 非法定的; 未入药典的
not having official authority or sanction
a sort of unofficial mayor
正在加载中文释义…
not having official authority or sanction
正在加载中文释义…
not officially established
an unofficial estimate
he participated in an unofficial capacity
the early election returns are unofficial
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Collins 词频等级为 2，建议结合例句记忆，而不是只背中文释义。
Dictionary facts from ECDICT.