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undetectable

adjective
🔊/ˌʌndɪˈtektəbl/
🔊/ˌʌndɪˈtektəbl/
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  1. impossible to see or find看不见的；察觉不出的；发现不了的
    • The sound is virtually undetectable to the human ear.这声音实际上是人耳难以听得到的。🔊🔊
    opposite detectable
    Oxford Collocations DictionaryUndetectable is used with these nouns:
    • level
    See full entry