Perversely bad, cruel, or wicked
Mary smiled; a devilish twinkle in her eye.
He laughed, his eyes sparkling with a devilish thought.
As no one could curse Jesus except under the influence of a devilish afflatus, so none could say "Jesus is Lord" except he was inspired by the Holy Spirit.
But how cast off all the superfluous, devilish burden of my outer man?
From Catholicism, which he very probably had no detailed knowledge of, he borrowed nothing, rejecting it as devilish error.