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startlingly + adjective
startlingly 通常放在所修饰的形容词之前，表示程度令人惊讶。
The results were startlingly clear.
结果惊人地清晰。
惊人地
先理解核心含义，再看它在真实句子里的用法。
惊人地
in a startling manner
The results were startlingly clear.
结果惊人地清晰。
令人吃惊地；惊人地；震惊地。
In a startling manner; surprisingly; shockingly.
The results of the survey were startlingly different from what we expected.
调查结果与我们预期的惊人地不同。
She looked startlingly young for someone with twenty years of experience.
她看起来惊人地年轻，尽管有二十年的经验。
The price of the house was startlingly low, so we decided to buy it immediately.
这栋房子的价格惊人地低，所以我们决定立即买下。
startlingly 通常放在所修饰的形容词之前，表示程度令人惊讶。
The results were startlingly clear.
结果惊人地清晰。
startlingly 也可修饰另一个副词，强调程度。
She spoke startlingly quickly.
她说话惊人地快。
startlingly 放在动词之后，表示动作发生的方式令人惊讶。
The situation improved startlingly.
情况惊人地改善了。
Not this
The cost of living rose startling in the past year.
Use this
The cost of living rose startlingly in the past year.
rose 是动作动词，需要用副词修饰，而 startling 是形容词，不能修饰动词。startlingly 才表示“惊人地”，与中文“惊人地”的副词功能对应。
Not this
Her new haircut looks startlingly.
Use this
Her new haircut looks startling.
looks 是系动词，后面应接形容词作表语，描述主语的状态，而不是用副词修饰动词。startlingly 是副词，应改为形容词 startling。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
惊人地简单
The solution was startlingly simple.
这个解决办法惊人地简单。
惊人地美丽
She looked startlingly beautiful in the morning light.
她在晨光中显得惊人地美丽。
惊人地清晰
The water was startlingly clear.
水惊人地清澈。
惊人地不同
The two versions are startlingly different.
这两个版本惊人地不同。
惊人地白
His teeth were startlingly white.
他的牙齿白得惊人。
惊人地熟悉
The face in the photo was startlingly familiar.
照片中的脸惊人地熟悉。
Use startlingly naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
联想 startle（使惊吓）：一件事令人 startled，便是“惊人地”。startlingly 含 startle + -ing + -ly，副词标识记得牢。
语域：mixed 常见场景：formal writing、news reporting、literary prose startlingly 表示“令人惊讶地、出人意料地”，属于中性偏正式的副词，多用于书面语（如正式文章、新闻报道、文学描写）来强调惊讶或反差；日常口语中较少单独使用，更常说 surprisingly。具体选择可根据语境判断。
没有常用词与 startlingly 真正押韵；startle 和 startling 的开头音与它相同，但结尾不同。willingly、smilingly、thrillingly、feelingly 都以 -lingly 结尾，拼写很像，但重读元音不同，并不押韵。
Dictionary facts from ECDICT, OCTANOVE, WIKTIONARY.