1
painless + noun
常用于描述医疗过程或体验。
The dentist promised a painless procedure.
牙医保证手术是无痛的。
无痛的；不痛的
先理解核心含义，再看它在真实句子里的用法。
无痛的；不痛的
not causing physical or psychological pain
The dentist promised a painless procedure.
牙医保证手术是无痛的。
无痛的；没有痛苦或麻烦的。
Free from pain; without pain or trouble.
不困难的；容易的。
Not difficult; easy.
The dentist told me the treatment would be painless.
牙医告诉我这种治疗不会痛。
She said the blood test was quick and painless.
她说验血又快又不痛。
Modern eye surgery is often painless.
现代眼科手术通常是无痛的。
常用于描述医疗过程或体验。
The dentist promised a painless procedure.
牙医保证手术是无痛的。
作表语，强调状态。
Modern laser treatments are nearly painless.
现代激光治疗几乎无痛。
指事情容易完成，不费力。
It is painless to set up the software.
安装这个软件不费力。
Not this
I feel painless after the injection.
Use this
I feel no pain after the injection.
painless 用于描述事物本身无痛，不用于描述人的感觉。应改为 feel no pain 或使用形容词修饰事物（如 The injection is painless.）。
Not this
She performed the surgery painless.
Use this
She performed the surgery painlessly.
修饰动词应用副词 painlessly，而非形容词 painless。painless 作表语或定语，不能修饰动作。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
无痛的手术/治疗过程
The dentist promised that removing the tooth would be a painless procedure.
牙医保证拔牙会是一个无痛的过程。
无痛苦的死亡
The old man said he hoped for a quick, painless death.
老人说他希望自己死得又快又无痛苦。
无痛的康复过程
Thanks to the new medication, her recovery was almost painless.
多亏了这种新药，她的康复过程几乎没有痛苦。
轻松的方法；不费劲的办法
The tutorial explains a painless way to learn basic grammar.
这篇教程介绍了一种轻松学习基础语法的方法。
自杀毫无痛苦。
The lyric 'Suicide is painless' comes from the theme song of M*A*S*H.
歌词“Suicide is painless”出自《陆军野战医院》的主题曲。
没那么糟，不痛的。
In The Princess Bride, Count Rugen says 'It's not that bad. It's painless' about his torture machine.
在电影《公主新娘》中，鲁根伯爵谈到他的刑具时说：“It's not that bad. It's painless。”
Use painless naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
拆开记忆：pain（疼痛）+ less（无/少），痛感消失，就是“无痛”。
语域：neutral 常见场景：医疗或牙科诊疗、日常评价事情容易 该词语气中性，正式与非正式场合都可用；表示“无痛的”时多用于医疗相关描述，表示“容易的、不费劲的”时比较常见于日常口语。
与 painless /ˈpeɪnləs/ 的发音比较：只有 brainless /ˈbreɪnləs/ 与之押韵（末尾同为 /eɪnləs/）。pain /peɪn/ 和 painkiller /ˈpeɪnkɪlər/ 共享 /peɪn/ 音；painful /ˈpeɪnfəl/ 同根但结尾是 /fəl/ 而非 /ləs/；careless /ˈkeərləs/ 虽同以 -less 结尾，但元音是 /eə/，不押韵；paint /peɪnt/ 是拼写相似词，多一个 /t/，读音不同。
Dictionary facts from ECDICT, WIKTIONARY.