1
become + unrecognizable
常与 become 连用，强调状态变化。
After the mudslide, the old road became unrecognizable.
泥石流过后，那条老路变得面目全非。
难以辨认的；面目全非的
先理解核心含义，再看它在真实句子里的用法。
难以辨认的；面目全非的
unrecognizable
After the mudslide, the old road became unrecognizable.
泥石流过后，那条老路变得面目全非。
不可识别的
s. defying recognition as e.g. because of damage or alteration
After the accident, his face was unrecognizable.
事故之后，他的脸变得难以辨认。
The old neighborhood has become unrecognizable since I left.
自从我离开后，这个老社区已经变得面目全非。
The fire left the painting unrecognizable.
大火让这幅画变得难以辨认。
常与 become 连用，强调状态变化。
After the mudslide, the old road became unrecognizable.
泥石流过后，那条老路变得面目全非。
look 后接形容词，描述外观使人难以辨认。
With her new haircut and glasses, she looked unrecognizable.
换了新发型又戴上眼镜后，她看上去让人认不出来了。
render 后接宾语和形容词，表示“使……变得……”，较正式。
The heat had rendered the plastic container unrecognizable.
高温使那个塑料容器变得面目全非。
用 to 引出辨认者，说明对某人来说无法辨认。
The song was unrecognizable to anyone who knew the original.
任何听过原曲的人都听不出这首歌了。
Not this
After the accident, his face unrecognizable.
Use this
After the accident, his face was unrecognizable.
unrecognizable 是形容词，不能单独作谓语，必须与 be 动词连用构成系表结构；中文‘他的脸认不出来’没有动词，所以英文需要加 was。
Not this
That actor was unrecognizable for me in the new film.
Use this
That actor was unrecognizable to me in the new film.
表示‘对某人来说无法辨认’时，unrecognizable 后接介词 to 引出感知者，而不是 for；to me 相当于中文‘对我来说’，改用 to 才符合这个搭配。
Not this
He cannot recognize after the accident because his face is swollen.
Use this
He is unrecognizable after the accident because his face is swollen.
原句用主动式 cannot recognize，但 recognize 是及物动词，不能没有宾语；而要表达‘他（因面部肿胀而）认不出来’这种被动含义时，应使用形容词 unrecognizable 与 be 动词构成系表结构。改后既补全了语法又表达了‘无法被认出’的意思。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
几乎认不出来的；几乎面目全非的
After the fire, the old library was almost unrecognizable.
火灾之后，那座旧图书馆几乎面目全非了。
完全认不出来的；彻底面目全非的
She dyed her hair and lost weight, so she was completely unrecognizable.
她染了头发又瘦了身，所以完全认不出来了。
使某物面目全非
The crash rendered the car completely unrecognizable.
车祸使那辆车完全面目全非了。
变得认不出来；变得面目全非
The city has become unrecognizable after decades of rebuilding.
经过几十年的重建，这座城市已经变得认不出来了。
对某人来说认不出来
His voice was unrecognizable to me over the phone.
在电话里，他的声音我完全听不出来。
Use unrecognizable 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：un-（不）+ recognize（认出）+-able（能）→ 认不出来。想象熟人被烧得面目全非，完全无法认出，就是 unrecognizable。
语域：neutral 常见场景：描述人因受伤、患病或衰老而难以辨认、描述地方或物体经破坏、改变后难以辨认、对比旧照片或影像与当前模样 该词为中性语体，日常口语和书面写作都常见。通常用来形容人或事物因受损、改变、伪装等原因而认不出来，比较自然，无特殊正式或非正式限制。
recognizable 与目标词押韵（重读元音 /ɛ/ 及之后的音相同：/ˈrekəɡnaɪzəbəl/ 对 /ʌnˈrekəɡnaɪzəbəl/）。其余词都以 -able 结尾、尾音为非重读 /əbəl/，但重读元音不同，所以只是拼写/尾音相似，不是真正的押韵。
Dictionary facts from ECDICT, WIKTIONARY.