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uncommonly + adjective/adverb
此时 uncommonly 是程度副词，相当于 very 或 extremely，多用于正式或书面语。
The concert was uncommonly good.
这场音乐会极其精彩。
非常；极其；非凡地
先理解核心含义，再看它在真实句子里的用法。
非常；极其；非凡地
exceptionally
The concert was uncommonly good.
这场音乐会极其精彩。
不寻常地；极其；非常。
To an uncommon degree; unusually or extremely.
不常；难得。
Not often; on rare occasions.
The weather in April was uncommonly warm this year.
今年四月的天气异常暖和。
She is uncommonly good at solving difficult puzzles.
她非常擅长解难题。
He spoke uncommonly slowly, so everyone could follow.
他说得极慢，以便每个人都能跟上。
此时 uncommonly 是程度副词，相当于 very 或 extremely，多用于正式或书面语。
The concert was uncommonly good.
这场音乐会极其精彩。
此时 uncommonly 表示“很少、难得”，相当于 rarely，常用在被动结构中；注意不要与“非常”的含义混淆。
That species is uncommonly seen in this area.
那个物种在这一带难得见到。
Not this
She is uncommon beautiful.
Use this
She is uncommonly beautiful.
uncommonly 是副词，用来修饰形容词 beautiful；uncommon 是形容词，不能修饰形容词。中文“非常漂亮”中的“非常”对应副词，所以要用 uncommonly。
Not this
It is an uncommonly event.
Use this
It is an uncommon event.
event 是名词，需要形容词 uncommon 来修饰；uncommonly 是副词，不能修饰名词。中文“不寻常的事件”中的“不寻常”是形容词，因此应改为 uncommon。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
格外好；异常出色
The soup at that little café was uncommonly good.
那家小咖啡馆的汤格外好喝。
非常好；异常出色
He did uncommonly well in the final exam.
他在期末考试中表现得异常出色。
非常有才华；天赋异禀
She is an uncommonly talented musician.
她是一位非常有才华的音乐家。
异常安静；出奇地安静
The office was uncommonly quiet on Monday morning.
周一早上办公室异常安静。
异常慷慨；格外大方
He was uncommonly generous with his time.
他在时间上表现得异常慷慨。
非常聪明；异常聪慧
The research team has produced an uncommonly bright young physicist.
这个研究团队培养出了一位非常聪明的年轻物理学家。
并不少见地；经常
Not uncommonly, the best ideas come when you least expect them.
最好的想法常常在意想不到的时候出现。
Use uncommonly naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
un-加common（普通），不普通就是“非凡地”；既指“极其”，也指“难得地”。
语域：formal 常见场景：formal writing、literary prose uncommonly 通常用于正式或文学书面语，表示“非常、极其”或“罕见地、难得地”。口语中较少用，表达同样意思时多可用 very 或 rarely 替换。
作程度副词时意为“非常、极其”，作频率副词时意为“罕见地、难得地”。
Dictionary facts from ECDICT, WIKTIONARY.