flusters

To fluster someone is to make them agitated, confused, or nervous, typically through unexpected pressure or attention.

The state itself is also called a fluster: She was in such a fluster before the interview that she forgot her portfolio.

People get flustered when they're put on the spot, caught off guard, or overwhelmed by competing demands.

The word often implies visible signs of discomfort—blushing, stammering, or losing one's train of thought.