How to remove all lines that contain not a single English word?

apple guava

New member
Hi, I have a large text file which contains about 4000 lines.
90% of these lines contain at least one English word in them.
About 10% of the lines contain not even one single English word.
I would like those lines that contain not a single English word, to be removed from the file.

How do I achieve this please? Thanks.

I use Ubuntu and Windows 7.

(PS, I also have a directory that contains 40,000 files. Each file is a different English word; if this is useful).
 
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