Word · CEFR C1 · Frequency #5599
spontaneous
即兴的；未经事先计划的；一时冲动的
Done or said on impulse, without prior planning or preparation.
- 1.
Self-directed; happening or acting without external cause or instigation; proceeding from natural feeling, temperament, or momentary impulse.
自发的；无外力引起或促使的；出于自然情感、性情或一时冲动的。
- 2.
happening or arising without apparent external cause
无明显外部原因的发生或出现
- 3.
Done by one's own free choice, or without planning.
出于自愿的；未经计划的。
- 4.
said or done without having been planned or written in advance
未经计划或事先准备的言行
- 5.
Controlled and directed internally; self-active; spontaneous movement characteristic of living things.
内部控制和引导的；自身活动的；生物特有的自发运动。
- 6.
Produced without being planted or without human cultivation or labor.
非种植或未经人工培育、劳动而产生的；野生的。
- 7.
Sudden, without warning.
突然的；无预兆的。
- 8.
Said or done without prior planning or prior writing.
未经事先计划或事先书写而说出或做出的。
自发的；自然的；非外力引起的；突然的；无预兆的；野生的；自然生长的；自发的；无外力引起或促使的；出于自然情感、性情或一时冲动的。；无明显外部原因的发生或出现
In use
Her spontaneous laugh made everyone in the room smile.
We made a spontaneous decision to drive to the coast on Saturday.
The audience gave the singer a spontaneous round of applause.
spontaneous laughter
spontaneous combustion
a spontaneous abortion
spontaneous + noun
作定语，修饰名词。
She gave a spontaneous answer.
她给出了一个自发的回答。
be spontaneous
作表语，描述主语的性质。
Connections
Collocations
- spontaneous combustion
- 自燃
- The haystack caught fire due to spontaneous combustion.干草堆因自燃而着火。
- spontaneous applause
- 自发的掌声
- The audience burst into spontaneous applause at the end of the speech.演讲结束时，观众爆发出自发的掌声。
- spontaneous decision
- 冲动的决定
- Making a spontaneous decision to travel can be exciting.冲动决定去旅行可能会很刺激。
- spontaneous laughter
- 不由自主的笑声
- Her joke evoked spontaneous laughter from everyone.她的笑话引得大家不由自主地笑了起来。
- spontaneous recovery
- 自然恢复
- The patient showed signs of spontaneous recovery after the fever broke.退烧后，病人显示出自然恢复的迹象。
Learner notes
Memory Tip
spontaneous（自发的）可联想'思碰'：不加思考就碰到，自然发生。
Context & Register
混合语境：既常见于日常对话（如 spontaneous decision），也用于学术或科学描述（如 spontaneous combustion）。通常形容词形式，指未经计划或外部触发。
Pronunciation & Spelling
All listed words rhyme with /eɪniəs/ and share the spelling chunk '-aneous'. Words like 'homogeneous' (/hoʊməˈdʒiːniəs/) look similar but have a different vowel sound.
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。
Dictionary facts from ECDICT, OCTANOVE, WIKTIONARY.