Baneful

Let me now take a more comprehensive view, and warn you in the most solemn manner against the baneful effects of the spirit of party generally.

If the basis of popular government in peacetime is virtue, the basis of popular government during a revolution is both virtue and terror; virtue, without which terror is baneful; terror, without which virtue is powerless.

In contrast in England the Pre-Raphaelite Brotherhood explicitly reacted against his influence (and that of his admirers such as "Sir Sploshua"), seeking to return to styles before what they saw as his baneful influence.