"Brown is a strong color."

Translation: A barna egy erős szín.

[_paranoia_]

Is it correct without the indefinite article? "A barna erős szín"?

[Marvin502271]

Yes, I just tried and it was accepted.

[BigWayne19]

------- but it does have to have the definite article: "A " barna ero"s szi'n . . .

Big 9 dec 19

[JohnWeber786406]

Why? I would have missed it in the word selection! :(

[Arcaeca]

What exactly is a "strong" color, exactly?

[vvsey]

Intensive, dark, something like that. It can be too much in certain cases. Like if you paint the walls of your home brown, that could be a bit too much.
So, it is a "strong" color, use it sparingly, carefully, in moderation.