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Definition of deleterious:

  1. Hurtful; noxious; destructive; pernicious; as, a deleterious plant or quality; a deleterious example.

Synonyms:

perverting, ill, unhealthful, pestilential, injurious, mischievous, bad, poisonous, noisome, baneful, ruinous, foul, noxious, evil, hurtful, study at pernicious, help, insalubrious, harmful, pestiferous, pernicious.

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