destructive

adj. 1 (often foll. By to, of) destroying or tending to destroy. 2 negatively critical.  destructively adv. Destructiveness n.

a. Causing destruction; tending to bring about ruin, death, or devastation; ruinous; fatal; productive of serious evil; mischievous; pernicious; -- often with of or to; as, intemperance is destructive of health; evil examples are destructive to the morals of youth.