1. harmful
Pernicious (L. per, through, and neco, kill) signifies having the power of destroying or injuring, tending to hurt or kill. Pernicious is stronger than injurious; that which is injurious
Synonyms: pernicious, bad, evil, mischievous, pestilential, baneful, foul, noisome, poisonous, deadly, harmful, noxious, ruinous, deleterious, hurtful, perverting, unhealthful, destructive, injurious, pestiferous, unwholesome, detrimental, insalubrious
Antonyms: advantageous, favorable, helpful, profitable, serviceable, beneficent, good, invigorating, rejuvenating, useful, beneficial, healthful, life-giving, salutary, wholesome
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Synonyms for harmful 
