miscreant

Concise Oxford English Dictionary © 2008 Oxford University Press:
miscreant /ˈmɪskrɪənt/

▶noun

• 1 a person who behaves badly or unlawfully.

• 2 archaic a heretic.

▶adjective

• 1 behaving badly or unlawfully.

• 2 archaic heretical.

– origin ME (as adj. meaning ‘disbelieving’): from OFr. mescreant, pres. part. of mescreire ‘disbelieve’, from mes- ‘mis-’ + creire ‘believe’ (from L. credere).