The skies grew grayer, and he heard thunder rumble in the distance.

His haggard face grew even grayer as he listened to an excited voice on the other end of the wire.

Meanwhile the weeks passed and Maurice slowly grew grayer and more wrinkied.

Trudging through a gray emptiness that grew emptier and grayer with every step.

Although statistics are scarce, audiences in concert halls seem to be growing grayer.

His face grew even grayer than before.

His hair had grown much grayer, and the strong old hand shook a little.

The clouds grew grayer and it began to snow again.

A light cold rain had begun to fall, the sky was growing grayer, and we did not linger.

The lines in his face were growing deeper each day, and even his hair seemed to be growing grayer.