Noah Webster's New International Dictionary of the English Language

1. (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.

2. (n.) One who destroys; a radical reformer; a destructionist.