adj. 25B6; adjective
the most destructive war : DEVASTATING, ruinous, disastrous, catastrophic, calamitous, cataclysmic; harmful, damaging, detrimental, deleterious, injurious, crippling; violent, savage, fierce, brutal, deadly, lethal.
destructive criticism : NEGATIVE, hostile, vicious, unfriendly; unhelpful, obstructive, discouraging.