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Discover LudwigThe phrase "extremely deadly" is correct and usable in written English.
You can use it when referring to something that has great potential to cause harm and even death. For example, "The virus is extremely deadly, with a high fatality rate of 30%."
Exact(33)
Unfortunately, even with appropriate treatment, calciphylaxis remains extremely deadly.
It was a new and extremely deadly virus: Ebola.
The wars in Korea and Indochina were extremely deadly.
Also called jequirity beans, these piously-named seeds contain abrin, an extremely deadly ribosome-inhibiting protein.
He can be funny, mercurial and extremely deadly, often in the same sentence.
But the virus was extremely deadly, killing 8 of 12 people infected in Thailand and 15 of 22 in Vietnam, many of them children.
Similar(27)
"Our best judgment," she said, defending the decision to establish a no-fly zone to prevent atrocities, was that failure to do so would have been "extremely chilling, deadly and indeed a stain on our collective conscience".
Jessica Silver, 14, is battling an extremely rare, deadly cancer of which there are only dozens of cases and for which there is no known cure, called Nut Midline Carcinoma.
It accused the Syrian government of using "extremely lethal" chemical weapons -- including those containing the deadly nerve agent sarin -- on several occasions to sow "terror" among civilian populations.
The most common reaction was that while Colton may be a nice guy, he's extremely boring — a deadly ingredient in any reality show.
For the, the infection can be extremely dangerous and deadly.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com