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The phrase "a hard subject" is correct and usable in written English.
It can be used to describe a topic or area of study that is challenging or difficult to understand.
Example: "Mathematics has always been a hard subject for me, but I am determined to improve my skills."
Alternatives: "a challenging topic" or "a difficult subject".
Exact(21)
She really made a hard subject super easy to understand.
That may be a hard subject to avoid in Jerusalem.
"I use a happy color palette for a hard subject," Mr. Alsoudani said.
For that matter, it's a hard subject for the rest of us to think about intelligently.
"Golf is a hard subject because it's a solitary person in a plane of space.
Whitewater is a hard subject for those of us on the outside to discuss.
Similar(39)
But of course as to whether there is life out there, biology is a harder subject than astronomy, because it deals with more complex things and we don't understand how life began on Earth.
"It is a very hard subject for an academic or anyone else to study, because by definition it takes place under the table".
It's a pretty hard subject and he got a flat 1 on it.
In this portrait, the "prose sizzles -- hard, tough writing suited to a hard, tough subject," Vincent Patrick said here in 2000.
The problem of voting machines has all the characteristics of an important, hard subject.
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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