Uncertainty flickered in her beautiful eyes, then she came towards him.

Uncertainty flickered briefly.

Uncertainty flickered over the double's face; and Kirk, in a kind of dream, knew he was seeing the reflection of his own new uncertainty.

Uncertainty flickered through her.

Uncertainty flickered its dark flame in Arthur's eyes.

Uncertainty flickered in Brian's eyes.

Uncertainty flickered in her dark eyes for a millisecond, then was replaced by utter determination as the major made her decision.

Uncertainty flickered in her eyes.

Uncertainty flickered in his eyes.