I felt a vague fear rising in the back of my mind, like a wave.

From a vague fear her mind was transferred to a very tangible one.

She lay in the dark, her eyes wide open, feeling a vague fear.

There was something in his attitude that filled Molly with a vague fear.

The vague fear in his mind made him hard to read.

Still, his desire to cool off in the water was stronger than all vague dark fears.

Was there a trace of some vague fear inside him?

As the day progressed, those vague fears developed a specific focus.

Halted by some vague fear, he heard still further sounds below.

She was aware of a vague fear inside her.