1.   For the past half-hour she had been feeling distinctly uneasy as the ever-present shadows had deepened into almost impenetrable blackness.

2.   As the future brightens statistically in the news, the shadows deepen in the public consciousness.

3.   As the shadows deepened, I felt terribly lonely, but it was good preparation, I thought, for being a widow.

4.   From all these standpoints, the nuclear shadow has deepened.