Destructive

Part of speech: noun (n.)

One who destroys; a radical reformer; a destructionist.

Part of speech: adjective (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. Time's destructive power. Wordsworth. Destructive distillation. See Distillation. -- Destructive sorties ( (Logic), a process of reasoning which involves the denial of the first of a series of dependent propositions as a consequence of the denial of the last; a species of reductio ad absurdum. Whately.

Synonyms: Mortal; deadly; poisonous; fatal; ruinous; malignant; baleful; pernicious; mischievous.