heaven knows

idiom

informal

—used to stress that something is not known

"How long will the meeting last?" "Heaven (only) knows."

Examples of heaven knows in a Sentence

Recent Examples on the Web

The result is musically bland, but scarily realistic and also pretty funny, though heaven knows whose source material is being used. —David Meyer, Fortune, 11 Apr. 2024

Nevertheless, the intrusions from passing players, often intent on killing Sam or Mark or each other, and non-player characters (NPCs) seem real enough — and heaven knows dramatic recreations are rampant these days in documentaries, there to fill out the bits the camera could never have captured. —Leslie Felperin, The Hollywood Reporter, 10 Mar. 2024

The official royal coronation shop has released commemorative tote bags and honey-dippers and heaven knows what else; the official dish is a quiche made with spinach and fava beans. —Monica Hesse, Washington Post, 5 May 2023