adj. (wickeder, wickedest) 1 sinful, iniquitous, given to or involving immorality. 2 spiteful, ill-tempered; intending or intended to give pain. 3 playfully malicious. 4 colloq. foul; very bad; formidable (wicked weather; a wicked cough). 5 sl. excellent, remarkable. Wicked Bible an edition of 1631, with the misprinted commandment 'thou shalt commit adultery'. wickedly adv. wickedness n.
[ ME f. obs. wick (perh. adj. use of OE wicca wizard) + -ED(1) as in wretched ]