Word · Frequency #18643
undetected
未被察觉的；未被发现的
not noticed or detected
- 1.
Not found; undiscovered.
未被发现的；未被察觉的。
未被发现的；未被察觉的。；未被发现的
In use
The virus remained undetected for weeks.
She managed to leave the building undetected.
The error went undetected until the final review.
remain undetected
remain 作系动词，后接形容词作表语，强调持续处于未被发现的状态。
The virus can remain undetected for weeks.
这种病毒可能数周都未被发现。
go undetected
go 在此表示变为或保持某种状态，go undetected 常指未被察觉而通过。
Many errors go undetected during the review.
许多错误在审查过程中未被发现。
undetected by [someone/something]
by 后接施动者，表示未被某人或某物发觉。
The signal was undetected by the radar.
该信号未被雷达探测到。
Common mistakes
The mistake was undetected from the teacher.The mistake was undetected by the teacher.
undetected 之后表示“被……发现”时要用介词 by，不能用表示来源的 from。中文“对老师来说未被发现”容易错用 from，但英语中表达被动意义时接施动者用 by。
The poison is undetected in water.The poison is undetectable in water.
要表达“无法被检测出来”时该用 undetectable；undetected 只能表示“未被发现”的当前状态，并不表示能力上的不可能。中文“检测不出来”容易误用 undetected。
The spy undetected for months.The spy went undetected for months.
undetected 是形容词，不能单独作谓语。中文“未被发现”可以省略动词，但英语句子必须有系动词或 go/remain 等连系动词，因此要加上 went。
Connections
Collocations
- go undetected
- 未被发现；不被察觉
- The spy was able to go undetected for many years.那名间谍多年来一直未被发现。
- remain undetected
- 一直未被发现
- Some tumors remain undetected until later stages.有些肿瘤直到晚期才被发现。
- undetected error
- 未被发现的错误
- An undetected error in the code caused the system to crash.代码中一个未被发现的错误导致系统崩溃。
- undetected disease
- 未被察觉的疾病
- Early screening can help catch undetected disease.早期筛查有助于发现未被察觉的疾病。
- pass undetected
- 不被察觉地通过；蒙混过关
- The forged signature passed undetected through security.那个伪造的签名在安检中蒙混过关，未被发现。
Idioms & figurative uses
Learner notes
Memory Tip
回想安检门：你悄悄走过，机器没响——un（不）+ detected（被检测到）= 未被发现的。
Context & Register
语域：neutral 常见场景：医学检查、安全监控、新闻报道 该词属于中性偏正式的书面用语，通常用于医学检查、安全监控或新闻报道等场景；口语中更常说 didn't notice 或 was not found。
Pronunciation & Spelling
除 undecided 外，detected、expected、respected、protected、corrected 都与 undetected 押韵：其重读音节均以 /-ɛktɪd/ 结尾，与 undetected 的 -tected 发音相同。undecided 开头拼写相似，但读作 /ˌʌndɪˈsaɪdɪd/，并不押韵。
Dictionary facts from ECDICT, WIKTIONARY.