の言うことなんか

what ... says

→ の
phrase Rare #35,140
what ... says なんか adds a dismissive or belittling tone, suggesting that what the person says is unimportant or not worth taking seriously.
JA: 彼の言うことなんか気にしないで。
EN: Don’t worry about what he says.

トムの言うことなんか気にしなくていいよ。

You don't need to worry about what Tom says.

あいつの言うことなんか、あてにならないよ。

You can't rely on anything he says.

あんな悲観的な経済学者たちの言うことなんか、全然当てにならないよ。

You can't rely on anything those pessimistic economists say.

あいつらの言うことなんか、気にしなくていいから。

You don't need to worry about what they say.

あいつの言うことなんか気にするな。

Don't pay any attention to what that guy says.