grow dull

She let her colour go—the forced smile fade away—the eyes grow dull with heavy pain.

And never again in the years to come did the diamonds on King Horn's ring grow dull or dim.

The three fiery Carbonari gradually felt their revolutionary ardor grow dull.

Too much has weighed upon me to enable me ever to breathe freely as a man should if he does not want to grow dull and care-laden.

Our faces grow dull and lifeless in the indistinct light which filters doubtfully through the blue shade.