Meanings of perniciousness in English

And the Civil War taught me the perniciousness of following your conscience regardless of the consequences.

The instability of life and happiness was forcibly illustrated, as well as the perniciousness of error.

They thought him arrogant and amoral, a detrimental force whose perniciousness was amplified by his inexplicably tight bond with the Clintons.

Seemingly out of nowhere, the race had suddenly turned racial, with both Bill and Hillary being accused of insensitivity at best and perniciousness at worst.

'Not on Sundays, sir,' said Peterborough, openly and cordially, as to signify that they were of one mind regarding the perniciousness of Sunday smoking.