unnatural (adj.) 2
abnormal, monstrous, aberrant
3H6 II.v.90 [Father to himself, of the war] What stratagems ... / Erroneous, mutinous, and unnatural, / This deadly quarrel daily doth beget!
KL I.i.219 [France to Lear, of Cordelia] her offence / Must be of such unnatural degree
Mac V.i.67 [Doctor to Gentlewoman] unnatural deeds / Do breed unnatural troubles
RJ V.iii.152 [Friar to Juliet] come from that nest / Of death, contagion, and unnatural sleep