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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。
即兴的；未经事先计划的；一时冲动的
先理解核心含义，再看它在真实句子里的用法。
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.
She gave a spontaneous answer.
她给出了一个自发的回答。
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。
Self-directed; happening or acting without external cause or instigation; proceeding from natural feeling, temperament, or momentary impulse.
无明显外部原因的发生或出现
happening or arising without apparent external cause
出于自愿的；未经计划的。
Done by one's own free choice, or without planning.
未经计划或事先准备的言行
said or done without having been planned or written in advance
Her spontaneous laugh made everyone in the room smile.
她不加掩饰的笑声让房间里所有人都笑了。
AI contextual example
We made a spontaneous decision to drive to the coast on Saturday.
我们临时决定星期六开车去海边。
AI contextual example
The audience gave the singer a spontaneous round of applause.
观众自发地为歌手鼓起了掌。
AI contextual example
spontaneous laughter
自然的笑声
WordNet
作定语，修饰名词。
She gave a spontaneous answer.
她给出了一个自发的回答。
作表语，描述主语的性质。
His reaction was spontaneous.
他的反应是自发的。
表示在某方面表现自发。
He is spontaneous in helping others.
他自发地帮助他人。
Not this
It was a spontaneously decision.
Use this
It was a spontaneous decision.
错误：使用了副词 spontaneously 修饰名词 decision，应改为形容词 spontaneous。
Not this
The event was spontanous and fun.
Use this
The event was spontaneous and fun.
错误：拼写错误，spontaneous 的正确拼写为 s-p-o-n-t-a-n-e-o-u-s，缺漏字母 e。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
自燃
The haystack caught fire due to spontaneous combustion.
干草堆因自燃而着火。
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。
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。
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。
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。
Use spontaneous naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
spontaneous（自发的）可联想'思碰'：不加思考就碰到，自然发生。
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。
All listed words rhyme with /eɪniəs/ and share the spelling chunk '-aneous'. Words like 'homogeneous' (/hoʊməˈdʒiːniəs/) look similar but have a different vowel sound.
Dictionary facts from ECDICT, OCTANOVE, WIKTIONARY.