の言うことなんか

what ... says

→ の
phrase Rare #33,102
what ... says Used dismissively to refer to someone's words, opinions, or advice, often in expressions like 気にするな (don't worry about it) or あてにならない (can't be relied on). The person or group comes before の, such as あいつの言うことなんか (what that guy says).
JA: 専門家の言うことなんか、気にしなくていいよ。
EN: You don't need to worry about what the experts say.

あんな悲観的経済学者たちの言うことなんか全然当てにならない

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

トムの言うことなんか気にしなくていい

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

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あてにならない

You can't rely on anything he says.

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.