Destructive

a.	1.	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.
n.	1.	One who destroys; a radical reformer; a destructionist.

Adj.

1.

destructive - causing destruction or much damage; "a policy that is destructive to the economy"; "destructive criticism" Antonyms: constructive - constructing or tending to construct or improve or promote development; "constructive criticism"; "a constructive attitude"; "a constructive philosophy"; "constructive permission"

adverse, annihilative, antithetical, bad, baleful, black, brutal, calamitous, cataclysmal, cataclysmic, catastrophic, catching, communicable, condemnatory, conflicting, consuming, consumptive, contagious, contradictory, contrary, critical, damaging, dangerous, death-bringing, deathful, deathly, demolishing, demolitionary, depredatory, derogatory, desolating, destroying, detrimental, devastating, dire, disapproving, disastrous, disparaging, doomful, envenomed, fateful, fell, feral, fratricidal, grievous, harmful, hurtful, infectious, infective, internecine, killing, lethal, malign, malignant, mephitic, miasmal, miasmatic, miasmic, mortal, negative, nihilist, nihilistic, opposed, opposing, pestiferous, pestilential, poisonous, ravaging, ruining, ruinous, savage, self-destructive, shattering, subversionary, subversive, suicidal, toxic, toxicant, toxiferous, tragic, unfavorable, unwholesome, vandalic, vandalish, vandalistic, venenate, veneniferous, venenous, venomous, virulent, wasteful, wasting, withering, wreckful