1
verb + imperceptibly
imperceptibly 常位于动词后或句末，强调变化极其微小，几乎无法察觉。
The landscape changed imperceptibly as we drove.
我们开车时，沿途的风景在不知不觉中变化着。
难以察觉地；极微小地；不知不觉地
先理解核心含义，再看它在真实句子里的用法。
难以察觉地；极微小地；不知不觉地
in an imperceptible manner or to an imperceptible degree
The landscape changed imperceptibly as we drove.
我们开车时，沿途的风景在不知不觉中变化着。
不易察觉地；因太小或太快而无法被察觉地。
Not noticeably; such that it cannot be detected, through being too small or too fast, etc.
以难以察觉的方式或程度
in an imperceptible manner or to an imperceptible degree
As the sun set, the room grew imperceptibly darker.
太阳落山时，房间不知不觉地变暗了。
AI contextual example
She nodded almost imperceptibly, so I was not sure whether she agreed.
她几乎不为人知地点了点头，所以我不确定她是否同意。
AI contextual example
Over the evening, the temperature dropped imperceptibly, and only when he shivered did he put on a jacket.
整个晚上，气温在不知不觉中下降，直到他打寒颤才穿上外套。
AI contextual example
the power of the Secretary of State in London increased gradually but imperceptibly
伦敦国务大臣的权力逐渐而难以察觉地增长。
WordNet
imperceptibly 常位于动词后或句末，强调变化极其微小，几乎无法察觉。
The landscape changed imperceptibly as we drove.
我们开车时，沿途的风景在不知不觉中变化着。
修饰形容词或副词时，imperceptibly 常与 small、slight、slowly 等表示微弱程度的词连用。
The difference is imperceptibly small.
这个差异微小得几乎察觉不到。
Not this
The color faded imperceptible over time.
Use this
The color faded imperceptibly over time.
这里修饰动词 faded（褪色），必须用副词 imperceptibly，不能用形容词 imperceptible。中文可以说“几乎察觉不到地褪色”，但英语中形容词不能修饰动词。
Not this
The imperceptibly changes in the schedule annoyed him.
Use this
The imperceptible changes in the schedule annoyed him.
changes 是名词，需要形容词 imperceptible 来修饰；副词 imperceptibly 只能修饰动词、形容词或副词。比较：the changes were imperceptible 和 the schedule changed imperceptibly。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
不知不觉地改变
Over the years, the town changed imperceptibly.
多年间，这个小镇不知不觉地发生了变化。
难以察觉地移动；悄悄转变
The light shifted imperceptibly as the afternoon passed.
随着下午的流逝，光线难以察觉地移动着。
不知不觉地增长
The gap between them grew imperceptibly over time.
他们之间的隔阂随着时间不知不觉地增大了。
不知不觉地消退；难以察觉地淡去
The colors faded imperceptibly under the sun.
在阳光下，颜色不知不觉地褪去了。
难以察觉地融合
The two styles merge imperceptibly in her paintings.
这两种风格在她的画作中难以察觉地融合在一起。
细微地改变；难以察觉地变化
His attitude altered imperceptibly after the conversation.
那次谈话之后，他的态度细微地改变了。
Use imperceptibly naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
记忆联想：猫的脚步轻得无声无息，变化就这样 imperceptibly 发生，你完全没注意到。
语域：formal 常见场景：文学作品、正式演讲、学术描述 该词常用于正式或文学性的语境，强调变化或过程极其细微、不易被察觉；在日常口语中不太常见，通常可用“不知不觉地”或“难以察觉地”来理解。
Only 'perceptibly' rhymes exactly: both it and the target have the stressed sequence /sɛptɪbli/. The other five share the spelling suffix '-ibly' but not the rhyme: 'incredibly' has /krɛdɪbli/ (the coda /d/ differs from /pt/), while 'visibly', 'audibly', 'legibly', and 'possibly' all use the weak vowel /ə/ in the suffix, giving /-əbli/ rather than /-ɪbli/.
Dictionary facts from ECDICT, OCTANOVE, WIKTIONARY.