delusion

a false belief or opinion about yourself or your situation ความเชื่อที่ผิด, การเข้าใจผิด, ความผิดพลาด, ความเชื่อที่ผิด

"I have no delusions about being able to win a medal or even being in the top 100 in the world,” she said.

Let us shift our focus away from whether or not the surveyed inflation is delusion.

Given the choice between delusion and reality, however ugly that reality might be, reality is always preferable.