3 adjectives to describe devilment

Look at those three monsters squatting there, plotting some ugly devilment or other!

I have seldom known a horrible situation handled with more delicate art; it is for this, rather than for its slightly unconvincing devilments, that I would give the book an honourable place in the ranks of Bensonian romance.

Then, at least, I should have known my danger, and been able to meet it; but to wait like this, through a whole night, picturing all kinds of unknown devilment, was to jeopardize one's sanity.

3 adjectives to describe  devilment