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The phrase "a sticky concept" is correct and usable in written English.
It can be used to describe an idea or notion that is difficult to grasp or that tends to linger in one's mind.
Example: "The theory of relativity is a sticky concept that often confuses students."
Alternatives: "a challenging idea" or "a perplexing notion".
Exact(1)
Here's what the Naming Group taught me about my own name: It should be "sticky," which is a sticky concept in itself.
Similar(58)
It's the perfect example of a "sticky wage" depressing employment, even though the "sticky wage" concept usually applies to jobs that people already have, not jobs they're applying for.
"It's a sticky mess".
It's a sticky business.
This was a sticky situation.
A sticky grip or something.
A sticky, sweaty, headache inducing nightmare.
Violin rosin is a sticky substance.
The pastry morphed into a sticky mess.
Often, they cite a sticky subway ride.
— John Brooks, "Five-Ten on a Sticky June Day," May 28 , 1955
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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