Definition of "chastened"

As I look back over life, I see periods, which possibly have been more crowded with ecstatic enjoyment but none in which there was more pure, equable chastened happiness, than those few weeks I spent with my children.

1861, E. J. Guerin, Mountain Charley, page 23

The Trump era is not quite over, however. There are still 10 days of this presidency left, and reports from the Oval Office suggest he no longer feels chastened, regretting having agreed to an orderly transition.

2021 January 9, Julian Borger, “Insurrection Day: when white supremacist terror came to the US Capitol”, in The Guardian‎