Synonyms for Destructive:

adj.

aggressive (adjective)
offensive.
baneful (adjective)
wicked.
destructive (adjective)
detrimental, devastating, deadly, deleterious, harmful, disastrous, injurious, calamitous, catastrophic, damaging.
evil (adjective)
revolting, repulsive, repugnant, disgraceful, foul, evil, hideous, sinful, damnable, baneful, sinister, monstrous, calamitous, bad, wicked, repellent, reprehensible, atrocious, terrible, offensive, nefarious, loathsome, heinous, detrimental, abominable.
harmful (adjective)
risky.
hurtful, disparaging (adjective)
corrosive, injurious, offensive, caustic, negative, adverse, erosive.
injurious, devastating (adjective)
detrimental, ruinous, dire, internecine, damaging, deadly, cataclysmic, cancerous, lethal, annihilative, evil, deleterious, suicidal, disastrous, fell, venomous, harmful, baleful, calamitous, toxic, fatal, catastrophic, baneful, mortal.
murderous (adjective)
murderous.

n.

hazardous, risky, perilous, unsafe, dangerous. fatal, help, fateful. destructive (noun)
annihilating, ravaging, vitriolic, devastating, ruinous, obliterating, wasteful, blasting, damaging, annihilative, corrosive, crushing, caustic, obscurant, cataclysmic, erosive, negative, cataclysmal, withering, soul-destroying.
unfavorable (noun)
unfavorable, adverse.

v.

destroying (verb)
murderous.

Other synonyms:

unfavorable. fatal. fatal
fateful.
malignant
cancerous.
virulent
venomous.
Other relevant words:
fateful, toxic, erosive, annihilative, lethal, mortal, hazardous, dire, disruptive, adverse, dangerous, internecine, baleful, fatal, obscurant, incendiary, help, withering, unfavorable, negative, murderous, soul-destroying, ravaging, fell, vitriolic, caustic, venomous, crushing, cataclysmic, risky, ruinous, unsafe, annihilating, cancerous, corrosive, wasteful, curative, perilous, suicidal, obliterating, blasting, subversive, cataclysmal.

Usage examples for destructive

  1. He developed destructive tendencies as a boy; he had to take everything to pieces. – Modern American Prose Selections by Various
  2. Many rivers were entirely choked by debris from the crumbled mountains and spread their waters in destructive floods. – The Boy With the U.S. Miners by Francis Rolt-Wheeler
  3. They were such timid folk, these sheep; their fears passed easily into destructive precipitances. – The Eagle's Heart by Hamlin Garland