Từ điển trực tuyến - Online Dictionary
undetectable
Advanced English Dictionary
+ adjective
impossible to see or find: The sound is virtually undetectable to the human ear.
Antonym: DETECTABLE


Random quote: All truths are easy to understand once they are discovered; the point is to discover them.: Galileo Galilei

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Updated: 14/03/2018: A new open-source Javascript engine/library named Howler has been employed to handle audiofile. Enjoy pronunciation!

Optional: 01/2018: Picture Dictionary

Updated: 05/06/2018: List of Academic Words