1 verse has
“speculation”
in Edition Clear Qur'an by Talal Itani / Al-Jaathiya (Crouching)
45:32And when it was said, “The promise of God is true, and of the Hour there is no doubt,” you said, “We do not know what the Hour is; we think it is only speculation; we are not convinced.”
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The Holy Quran · Al-Baqara (The Cow) · 2:274