what ... saysUsed 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.