become dull

I suppose there are people scared into religion through fear of the wrath to come, who may become dull and uninteresting.

Of Whom we have many things to say, and hard of interpretation, seeing ye are become dull of hearing.

After leading a regular, wholesome life for a period his mind would become dull, stale and unprofitable.

It was mentioned in the last chapter that a glaze free from alumina will devitrify or become dull.

She scarcely existed; her letters had become dull and infrequent; she had no wants and no curiosity.