1) Annihilating 2) Annihilative 3) Blasting 4) Cataclysmal 5) Cataclysmic 6) Caustic 7) Corrosive 8) Crushing 9) Damaging 10) Deadly 11) Devastating 12) Erosive 13) Evil 14) French word used in English 15) Harmful 16) Insidious 17) Malicious 18) Negative 19) Obliterating 20) Obscurant 21) Ravaging 22) Ruinous 
• (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. • (n.) One who destroys; a radical reformer; a destructionist.Destruct...
De·struc'tive adjective [ Latin destructivus : confer French destructif .] 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 destructi...
[adj] - causing destruction or much damage
adjective causing destruction or much damage; `a policy that is destructive to the economy`; `destructive criticism`
tending to destroy; causing destruction or much damage (often fol. by of or to): a very destructive windstorm. · tending to overthrow, disprove, or discredit (opposed to constructive): destructive criticism.
causing damage causing damage