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involuntarily + verb
将 involuntarily 放在动词前，强调动作并非出于本意。
He involuntarily flinched at the sudden noise.
听到突然的响声，他不自觉地退缩了一下。
非自愿地；不自觉地
先理解核心含义，再看它在真实句子里的用法。
非自愿地；不自觉地
against your will
He involuntarily flinched at the sudden noise.
听到突然的响声，他不自觉地退缩了一下。
不自觉地；无意识地；不由自主地。
In an involuntary manner; done without conscious thought.
She involuntarily flinched when the door slammed shut.
门砰地关上时，她不由自主地退缩了。
His eyes involuntarily moved toward the window during the long meeting.
开会时间很长，他的眼睛不由自主地朝窗户看去。
I involuntarily laughed at the joke even though I was trying to stay serious.
我不由自主地对这个笑话笑了出来，尽管我努力保持严肃。
将 involuntarily 放在动词前，强调动作并非出于本意。
He involuntarily flinched at the sudden noise.
听到突然的响声，他不自觉地退缩了一下。
动词后置的 involuntarily 常见于描述不由自主的身体反应。
She smiled involuntarily.
她不自觉地笑了。
该结构常与失业、退休等形容词/过去分词连用，表示并非自愿的状态。
Many workers were involuntarily unemployed during the crisis.
危机期间，许多工人非自愿地失业了。
Not this
She made an involuntarily movement when she heard the noise.
Use this
She made an involuntary movement when she heard the noise.
involuntarily 是副词，不能修饰名词 movement；修饰名词要用形容词 involuntary。中文的“无意识的”在这里应作定语。
Not this
He involuntarily gave his seat to the old man.
Use this
He voluntarily gave his seat to the old man.
想表达“自愿地”时不可用 involuntarily；in- 是否定前缀，involuntarily 意为“非自愿地、违背意愿地”，与 voluntarily 意思相反。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
非自愿失业的
He found himself involuntarily unemployed after the company downsized.
公司裁员后，他发现自己非自愿失业了。
被迫退休的
He was involuntarily retired at the age of 58.
他在58岁时被迫退休。
被强制入院的
She was involuntarily committed to a mental health facility.
她被强制送进了一家精神卫生机构。
不由自主地颤抖
I involuntarily shudder every time I think about that accident.
每次想到那场事故，我都会不由自主地颤抖。
不由自主地退缩
He involuntarily flinched when the doctor approached with the needle.
当医生拿着针靠近时，他不由自主地退缩了。
Use involuntarily naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
“in”表示否定，“volunt”像voluntary（自愿），再加副词尾巴“arily”→“非自愿地、不知不觉地”。
语域：formal 常见场景：formal writing、literary narration、reports of physical or emotional reactions 这个词多用于正式书面语和文学描写，比较常见于描述身体或情感上的不自主反应，或表示“并非出于本意”。在日常口语中，人们通常会说 without meaning to 或 unwillingly。
这些副词都由 -ary 结尾的形容词加 -ly 构成，拼写上 y 变 i（如 voluntary → voluntarily）。但读音不能按拼写类推：involuntarily 重音在 -vol-（inˈvɒləntərili），而 voluntarily 的一个常见读音重音在 -tar-（/ˌvɒlənˈtɛərəli/），necessarily 重音在 -ser-，temporarily、primarily、momentarily 多在前部，extraordinarily 重音在 -strɔː-，因此它们并不都与目标词完全押韵；只是共享末尾非重读的 /(ə)li/。
Dictionary facts from ECDICT, WIKTIONARY.